Operation Plumbbob

<h2 id="background">Background</h2>
The operation consisted of 29 <a href="/facts/Effects_of_nuclear_explosions/cReYEzPg">explosions</a>, of which only two did not produce any nuclear <a href="/facts/Nuclear_weapon_yield/53of1vqQ">yield</a>. Twenty-one laboratories and government agencies were involved. While most Operation Plumbbob tests contributed to the development of <a href="/facts/Warhead/DKJ7lyqb">warheads</a> for <a href="/facts/Intercontinental_ballistic_missile/0vKnj2Y7">intercontinental</a> and <a href="/facts/Intermediate-range_ballistic_missile/LoJL6GJt">intermediate</a> range <a href="/facts/Missile/C5VwQClz">missiles</a>, they also tested <a href="/facts/Anti-aircraft_warfare/fHtGQpLy">air defense</a> and <a href="/facts/Anti-submarine_weapon/auG9IyqG">anti-submarine</a> warheads with smaller yields. They included 43 military effects tests on civil and military structures, <a href="/facts/Radiation/RwMocyeq">radiation</a> and bio-medical studies, and aircraft structural tests. Operation Plumbbob had the tallest tower tests to date in the U.S. nuclear testing program as well as high-altitude <a href="/facts/Balloon/o9JQ2ykA">balloon</a> tests. One nuclear test involved the largest troop maneuver ever associated with U.S. nuclear testing.
Approximately 18,000 members of the U.S. <a href="/facts/United_States_Air_Force/7MxWBYlc">Air Force</a>, <a href="/facts/United_States_Army/WACWBEK9">Army</a>, <a href="/facts/United_States_Navy/xYK0fUou">Navy</a> and <a href="/facts/United_States_Marine_Corps/J8JDlJG2">Marines</a> participated in exercises <a href="/facts/Desert_Rock_VII/b6XYtGl5">Desert Rock VII</a> and <a href="/facts/Desert_Rock_VIII/b6XYtGl5">VIII</a> during Operation Plumbbob. The military was interested in knowing how the average foot-soldier would stand up, physically and psychologically, to the rigors of the tactical <a href="/facts/Nuclear_warfare/HLRLRh4F">nuclear battlefield</a>.
Almost 1,200 pigs were subjected to bio-medical experiments and blast-effects studies during Operation Plumbbob. On shot Priscilla (37 kt), 719 pigs were used in various experiments on <a href="/facts/Frenchman_Flat/1hcB39QD">Frenchman Flat</a>. Some pigs were placed in elevated cages and provided with suits made of different materials, to test which materials provided best protection from the <a href="/facts/Effects_of_nuclear_explosions/cReYEzPg">thermal radiation</a>. As shown and reported in the <a href="/facts/PBS/E6q9udH8">PBS</a> documentary <a href="/facts/Dark_Circle_(film)/r45J9wtL">Dark Circle</a>, the pigs survived, but with third-degree burns to 80% of their bodies.<a class="footnote-ref" id="fnref:2" href="#fn:2">2</a> Other pigs were placed in pens behind large sheets of glass at measured distances from the <a href="/facts/Hypocenter/uly7q7E0">hypocenter</a> to test the effects of flying debris on living targets.
Studies were conducted of <a href="/facts/Radioactive_contamination/Rd6dcVM9">radioactive contamination</a> and <a href="/facts/Nuclear_fallout/I1kJkLKt">fallout</a> from a simulated accidental detonation of a weapon, and projects concerning earth motion, blast loading and <a href="/facts/Neutron/oRCM1geb">neutron</a> output were carried out.
Nuclear weapons safety experiments were conducted to study the possibility of a nuclear weapon detonation during an accident. On July 26, 1957, a safety experiment, Pascal-A, was detonated in an unstemmed hole at the Nevada Test Site, becoming the first underground shaft nuclear test. The knowledge gained provided data to prevent nuclear yields in case of accidental detonations—for example, in a <a href="/facts/Aviation_accidents_and_incidents/l9JPLGqN">plane crash</a>.

The John shot on July 19, 1957, was the only test of the Air Force's <a href="/facts/AIR-2_Genie/gIhUzWUm">AIR-2A Genie</a> rocket with a nuclear warhead.<a class="footnote-ref" id="fnref:3" href="#fn:3">3</a> It was fired from an <a href="/facts/Northrop_F-89_Scorpion/RxIq2KHX">F-89J Scorpion</a> fighter over Yucca Flats at the <a href="/facts/Nevada_National_Security_Site/eWg04MIr">Nevada National Security Site</a>. On the ground, the Air Force carried out a public relations event by having five Air Force officers and a motion picture photographer stand under ground zero of the blast, which took place at between 18,500 and 20,000 feet (5,600 and 6,100 m) altitude, with the idea of demonstrating the possibility of the use of the weapon over civilian populations without ill effects.<a class="footnote-ref" id="fnref:4" href="#fn:4">4</a> The five officers were Colonel Sidney C. Bruce, later professor of Electrical Engineering at Colorado University, died in 2005; Lieutenant Colonel Frank P. Ball, died in 2003; Major John W. Hughes II, died in 1990; Major Norman B. Bodinger, died in 1997; Major Donald A. Luttrell, died in 2014.<a class="footnote-ref" id="fnref:5" href="#fn:5">5</a> The videographer, Akira "George" Yoshitake, died in 2013.<a class="footnote-ref" id="fnref:6" href="#fn:6">6</a>

The Rainier shot, conducted September 19, 1957, was the first fully contained underground nuclear test, meaning that no fission products were vented into the atmosphere. This test of 1.7 kt could be detected around the world by <a href="/facts/Seismology/Lony1LYX">seismologists</a> using ordinary seismic instruments. The Rainier test became the prototype for larger and more powerful underground tests.

Images from <a href="/facts/Upshot-Knothole_Grable/NuLlwymI">Upshot-Knothole Grable</a> were accidentally relabeled as belonging to the Priscilla shot from Operation Plumbbob in 1957. As a consequence publications including official government documents have the photo mislabeled. The shots can be told apart by the trails of test rockets, which are prominently featured in images and footage of Grable, but appear almost completely absent at the actual Priscilla shot.<a class="footnote-ref" id="fnref:7" href="#fn:7">7</a>

<h2 id="missing-steel-bore-cap">Missing steel bore cap</h2>
 In 1956, Robert Brownlee, from <a href="/facts/Los_Alamos_National_Laboratory/tlrLkV7r">Los Alamos National Laboratory</a> in <a href="/facts/New_Mexico/wosJCGaW">New Mexico</a>, was asked to examine whether nuclear detonations could be conducted underground. The first subterranean test was the nuclear device known as Pascal A, which was lowered down a 500 ft (150 m) borehole. However, the detonated yield turned out to be 50,000 times greater than anticipated, creating a jet of fire that shot hundreds of meters into the sky.<a class="footnote-ref" id="fnref:8" href="#fn:8">8</a> During the Pascal-B nuclear test of August 1957,<a class="footnote-ref" id="fnref:9" href="#fn:9">9</a><a class="footnote-ref" id="fnref:10" href="#fn:10">10</a> a 900-kilogram (2,000 lb) iron lid was welded over the borehole to contain the nuclear blast, despite Brownlee predicting that it would not work.<a class="footnote-ref" id="fnref:11" href="#fn:11">11</a> When Pascal-B was detonated, the blast went straight up the test shaft, launching the cap into the atmosphere. The plate was never found.<a class="footnote-ref" id="fnref:12" href="#fn:12">12</a> Scientists believe compression heating caused the cap to vaporize as it sped through the atmosphere.<a class="footnote-ref" id="fnref:13" href="#fn:13">13</a> A high-speed camera, which took one frame per <a href="/facts/Millisecond/xHCyv235">millisecond</a>, was focused on the borehole because studying the velocity of the plate was deemed scientifically interesting.<a class="footnote-ref" id="fnref:14" href="#fn:14">14</a> After the detonation, the plate appeared in only one frame. Regarding its speed Brownlee reckoned that "a lower limit could be calculated by considering the time between frames (and I don't remember what that was)", and joked that the best estimate was it was "going like a bat!".<a class="footnote-ref" id="fnref:15" href="#fn:15">15</a> Brownlee estimated that the explosion, combined with the specific design of the shaft, could accelerate the plate to approximately six times Earth's <a href="/facts/Escape_velocity/bdtme0tx">escape velocity</a>.<a class="footnote-ref" id="fnref:16" href="#fn:16">16</a>

<h2 id="list-of-tests">List of tests</h2>
See also: <a href="/facts/List_of_nuclear_weapons_tests_of_the_United_States/CLDmG7Ag">List of nuclear weapons tests of the United States</a>
United States' Plumbbob series tests and detonations<table><tbody><tr><th>Name</th><th>Date time (<a href="/facts/Universal_Time/l1FIFGKn">UT</a>) (<a href="/facts/Time_zone/x5JzdlX8">local</a>: <a href="/facts/Pacific_Standard_Time/v04MPIjz">PST</a>, −8 hrs)<a class="footnote-ref" id="fnref:17" href="#fn:17">17</a></th><th><a href="/facts/List_of_nuclear_test_sites/bkoRus4c">Location</a><a class="footnote-ref" id="fnref:18" href="#fn:18">18</a></th><th><a href="/facts/Elevation/h2d0u9nd">Elevation</a> + height <a class="footnote-ref" id="fnref:19" href="#fn:19">19</a></th><th>Delivery <a class="footnote-ref" id="fnref:20" href="#fn:20">20</a>Purpose <a class="footnote-ref" id="fnref:21" href="#fn:21">21</a></th><th><a href="/facts/List_of_nuclear_weapons/MwGSWHLV">Device</a><a class="footnote-ref" id="fnref:22" href="#fn:22">22</a></th><th><a href="/facts/Nuclear_weapon_yield/53of1vqQ">Yield</a><a class="footnote-ref" id="fnref:23" href="#fn:23">23</a></th><th><a href="/facts/Nuclear_fallout/I1kJkLKt">Fallout</a><a class="footnote-ref" id="fnref:24" href="#fn:24">24</a></th><th>References</th><th>Notes</th></tr><tr><th>Boltzmann</th><td>May 28, 1957 11:55:00.2</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area 7c <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.0947_N_116.0245_W_&title=Boltzmann">37°05′41″N 116°01′28″W / 37.0947°N 116.0245°W / 37.0947; -116.0245 (Boltzmann)</a></td><td>1,294 m (4,245 ft) + 150 m (490 ft)</td><td>tower,weapons development</td><td><a href="/facts/W40_(nuclear_warhead)/78BBy8Hb">XW-40</a></td><td>12 kt</td><td>I-131 venting detected, 1.9 MCi (70 PBq)</td><td><a class="footnote-ref" id="fnref:25" href="#fn:25">25</a><a class="footnote-ref" id="fnref:26" href="#fn:26">26</a><a class="footnote-ref" id="fnref:27" href="#fn:27">27</a><a class="footnote-ref" id="fnref:28" href="#fn:28">28</a><a class="footnote-ref" id="fnref:29" href="#fn:29">29</a><a class="footnote-ref" id="fnref:30" href="#fn:30">30</a></td><td>XW-40 lightweight boosted fission warhead test.</td></tr><tr><th>Franklin</th><td>June 2, 1957 11:54:59.9</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area T3 <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.0477_N_116.022_W_&title=Franklin">37°02′52″N 116°01′19″W / 37.0477°N 116.022°W / 37.0477; -116.022 (Franklin)</a></td><td>1,229 m (4,032 ft) + 90 m (300 ft)</td><td>tower,weapons development</td><td><a href="/facts/W30_(nuclear_warhead)/p3zffuxr">XW-30</a> ?</td><td>140 t</td><td>I-131 venting detected, 19 kCi (700 TBq)</td><td><a class="footnote-ref" id="fnref:31" href="#fn:31">31</a><a class="footnote-ref" id="fnref:32" href="#fn:32">32</a><a class="footnote-ref" id="fnref:33" href="#fn:33">33</a><a class="footnote-ref" id="fnref:34" href="#fn:34">34</a><a class="footnote-ref" id="fnref:35" href="#fn:35">35</a><a class="footnote-ref" id="fnref:36" href="#fn:36">36</a></td><td>XW-30 warhead test, fizzled. Retested successfully with Franklin Prime, with more fissile material in the core and different explosives.</td></tr><tr><th>Lassen</th><td>June 5, 1957 11:45:00.3</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area B9a ~ <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.1347_N_116.0417_W_&title=Lassen">37°08′05″N 116°02′30″W / 37.1347°N 116.0417°W / 37.1347; -116.0417 (Lassen)</a></td><td>1,595 m (5,233 ft) + 150 m (490 ft)</td><td>balloon,weapons development</td><td></td><td>600 t</td><td>I-131 venting detected, 100 Ci (3,700 GBq)</td><td><a class="footnote-ref" id="fnref:37" href="#fn:37">37</a><a class="footnote-ref" id="fnref:38" href="#fn:38">38</a><a class="footnote-ref" id="fnref:39" href="#fn:39">39</a><a class="footnote-ref" id="fnref:40" href="#fn:40">40</a></td><td><a href="/facts/Fizzle_(nuclear_test)/tgA1hNp4">Fizzle</a>, unboosted all-oralloy small weapon design.</td></tr><tr><th>Wilson</th><td>June 18, 1957 11:45:00.3</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area B9a ~ <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.1347_N_116.0417_W_&title=Wilson">37°08′05″N 116°02′30″W / 37.1347°N 116.0417°W / 37.1347; -116.0417 (Wilson)</a></td><td>1,589 m (5,213 ft) + 150 m (490 ft)</td><td>balloon,weapons development</td><td><a href="/facts/W45_(nuclear_warhead)/G19lRNRj">XW-45X1</a></td><td>10 kt</td><td>I-131 venting detected, 1.5 MCi (56 PBq)</td><td><a class="footnote-ref" id="fnref:41" href="#fn:41">41</a><a class="footnote-ref" id="fnref:42" href="#fn:42">42</a><a class="footnote-ref" id="fnref:43" href="#fn:43">43</a><a class="footnote-ref" id="fnref:44" href="#fn:44">44</a><a class="footnote-ref" id="fnref:45" href="#fn:45">45</a></td><td>XW-45X1 Swan test, gas-boosted composite pit.</td></tr><tr><th>Priscilla</th><td>June 24, 1957 13:30:00.1</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area 5 <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=36.798_N_115.9298_W_&title=Priscilla">36°47′53″N 115°55′47″W / 36.798°N 115.9298°W / 36.798; -115.9298 (Priscilla)</a></td><td>940 m (3,080 ft) + 210 m (690 ft)</td><td>balloon,weapons development</td><td><a href="/facts/Mark_15_nuclear_bomb/cYLFGQbu">Mk-15/39</a> primary</td><td>37 kt</td><td>I-131 venting detected, 5.8 MCi (210 PBq)</td><td><a class="footnote-ref" id="fnref:46" href="#fn:46">46</a><a class="footnote-ref" id="fnref:47" href="#fn:47">47</a><a class="footnote-ref" id="fnref:48" href="#fn:48">48</a><a class="footnote-ref" id="fnref:49" href="#fn:49">49</a><a class="footnote-ref" id="fnref:50" href="#fn:50">50</a></td><td>Effects shot with OTS weapon. Similar to that tested in Redwing Lacrosse.</td></tr><tr><th>Coulomb-A</th><td>July 1, 1957 17:30:??</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area S3h <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.053_N_116.034_W_&title=Coulomb-A">37°03′11″N 116°02′02″W / 37.053°N 116.034°W / 37.053; -116.034 (Coulomb-A)</a></td><td>1,231 m (4,039 ft) + 0</td><td>dry surface,safety experiment</td><td><a href="/facts/W31/Q3wJU98g">XW-31</a></td><td>no yield</td><td></td><td><a class="footnote-ref" id="fnref:51" href="#fn:51">51</a><a class="footnote-ref" id="fnref:52" href="#fn:52">52</a><a class="footnote-ref" id="fnref:53" href="#fn:53">53</a><a class="footnote-ref" id="fnref:54" href="#fn:54">54</a><a class="footnote-ref" id="fnref:55" href="#fn:55">55</a><a class="footnote-ref" id="fnref:56" href="#fn:56">56</a></td><td>Safety experiment, successful.</td></tr><tr><th><a href="/facts/Plumbbob_Hood/jhNqQb4Y">Hood</a></th><td>July 5, 1957 11:40:00.1</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area B9a ~ <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.1347_N_116.0417_W_&title=Hood">37°08′05″N 116°02′30″W / 37.1347°N 116.0417°W / 37.1347; -116.0417 (Hood)</a></td><td>1,285 m (4,216 ft) + 460 m (1,510 ft)</td><td>balloon,weapons development</td><td><a href="/facts/Swan_(nuclear_primary)/zDNP0wfX">Swan</a> primary and Whistle secondary. Full-scale test of device was <a href="/facts/Operation_Hardtack_I/1CV5gTEt">Hardtack I Maple</a> shot.<a class="footnote-ref" id="fnref:57" href="#fn:57">57</a></td><td>74 kt</td><td>I-131 venting detected, 11 MCi (410 PBq)</td><td><a class="footnote-ref" id="fnref:58" href="#fn:58">58</a><a class="footnote-ref" id="fnref:59" href="#fn:59">59</a><a class="footnote-ref" id="fnref:60" href="#fn:60">60</a><a class="footnote-ref" id="fnref:61" href="#fn:61">61</a><a class="footnote-ref" id="fnref:62" href="#fn:62">62</a></td><td>Largest atmospheric test in CONUS. Was a 2-stage thermonuclear device, even though AEC stated that no thermonuclear devices were being tested at the NTS. <a href="/facts/Desert_Rock_VII/b6XYtGl5">Desert Rock VII</a>.</td></tr><tr><th>Diablo</th><td>July 15, 1957 11:30:00.1</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area T2b <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.1502_N_116.1095_W_&title=Diablo">37°09′01″N 116°06′34″W / 37.1502°N 116.1095°W / 37.1502; -116.1095 (Diablo)</a></td><td>1,367 m (4,485 ft) + 150 m (490 ft)</td><td>tower,weapons development</td><td>Swan</td><td>17 kt</td><td>I-131 venting detected, 2.5 MCi (93 PBq)</td><td><a class="footnote-ref" id="fnref:63" href="#fn:63">63</a><a class="footnote-ref" id="fnref:64" href="#fn:64">64</a><a class="footnote-ref" id="fnref:65" href="#fn:65">65</a><a class="footnote-ref" id="fnref:66" href="#fn:66">66</a><a class="footnote-ref" id="fnref:67" href="#fn:67">67</a></td><td>Very similar to the Shasta test device. 2 stage. Misfired at first firing attempt three days earlier.</td></tr><tr><th>John</th><td>July 19, 1957 14:00:04.6</td><td>Launch from NTS, Areas 1–4, 6–10, Yucca Flat: 10 <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37_N_116.0539_W_&title=Launch_John">37°00′00″N 116°03′14″W / 37°N 116.0539°W / 37; -116.0539 (Launch_John)</a>, elv: 1,220 + 5,600 m (4,000 + 18,370 ft);Detonation over <a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.1605_N_116.0539_W_&title=John">37°09′38″N 116°03′14″W / 37.1605°N 116.0539°W / 37.1605; -116.0539 (John)</a></td><td>1,280 m (4,200 ft) + 5,639 m (18,501 ft)</td><td>Air launched rocket, weapon effect</td><td><a href="/facts/W25_(nuclear_warhead)/s95LBoWX">W-25</a></td><td>2 kt</td><td>I-131 venting detected, 6.1MCi?</td><td><a class="footnote-ref" id="fnref:68" href="#fn:68">68</a><a class="footnote-ref" id="fnref:69" href="#fn:69">69</a><a class="footnote-ref" id="fnref:70" href="#fn:70">70</a><a class="footnote-ref" id="fnref:71" href="#fn:71">71</a><a class="footnote-ref" id="fnref:72" href="#fn:72">72</a></td><td>Proof test of <a href="/facts/AIR-2_Genie/gIhUzWUm">AIR-2A Genie</a> air-to-air rocket. Test made famous by five USAF officers and a videographer standing at ground zero below the hypocentre and during the detonation, flash and blast.</td></tr><tr><th>Kepler</th><td>July 24, 1957 11:49:59.9</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area 4 <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.09549_N_116.10354_W_&title=Kepler">37°05′44″N 116°06′13″W / 37.09549°N 116.10354°W / 37.09549; -116.10354 (Kepler)</a></td><td>1,318 m (4,324 ft) + 150 m (490 ft)</td><td>tower,weapons development</td><td><a href="/facts/XW-35/svvKvFTF">XW-35</a> primary?</td><td>10 kt</td><td>I-131 venting detected, 1.7 MCi (63 PBq)</td><td><a class="footnote-ref" id="fnref:73" href="#fn:73">73</a><a class="footnote-ref" id="fnref:74" href="#fn:74">74</a><a class="footnote-ref" id="fnref:75" href="#fn:75">75</a><a class="footnote-ref" id="fnref:76" href="#fn:76">76</a><a class="footnote-ref" id="fnref:77" href="#fn:77">77</a><a class="footnote-ref" id="fnref:78" href="#fn:78">78</a></td><td>ICBM warhead, similar to Hardtack I/Koa.</td></tr><tr><th>Owens</th><td>July 25, 1957 13:29:59.7</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area B9b ~ <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.1347_N_116.0417_W_&title=Owens">37°08′05″N 116°02′30″W / 37.1347°N 116.0417°W / 37.1347; -116.0417 (Owens)</a></td><td>1,260 m (4,130 ft) + 150 m (490 ft)</td><td>balloon,weapons development</td><td><a href="/facts/XW-51/VEur1nxJ">XW-51</a> ?</td><td>9.7 kt</td><td>I-131 venting detected, 1.7 MCi (63 PBq)</td><td><a class="footnote-ref" id="fnref:79" href="#fn:79">79</a><a class="footnote-ref" id="fnref:80" href="#fn:80">80</a><a class="footnote-ref" id="fnref:81" href="#fn:81">81</a><a class="footnote-ref" id="fnref:82" href="#fn:82">82</a><a class="footnote-ref" id="fnref:83" href="#fn:83">83</a></td><td>Very small boosted <a href="/facts/Plutonium/4bUw9zH3">plutonium</a> device, XW-51 progenitor.</td></tr><tr><th>Pascal-A</th><td>July 26, 1957 08:00:00.0</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area U3j <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.05175_N_116.03415_W_&title=Pascal-A">37°03′06″N 116°02′03″W / 37.05175°N 116.03415°W / 37.05175; -116.03415 (Pascal-A)</a></td><td>1,202 m (3,944 ft)–150 m (490 ft)</td><td>underground shaft,safety experiment</td><td></td><td>55 t</td><td>I-131 venting detected, 10 kCi (370 TBq)</td><td><a class="footnote-ref" id="fnref:84" href="#fn:84">84</a><a class="footnote-ref" id="fnref:85" href="#fn:85">85</a><a class="footnote-ref" id="fnref:86" href="#fn:86">86</a><a class="footnote-ref" id="fnref:87" href="#fn:87">87</a></td><td>Originally Galileo A. One-point safety experiment, failure. Expected yield was less than 1 kg. A concrete cylinder perhaps 2 m (6 ft 7 in) thick 100 m (330 ft) up the tube disappeared.</td></tr><tr><th>Stokes</th><td>August 7, 1957 12:25:00.2</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area B7b ~ <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.0866_N_116.0245_W_&title=Stokes">37°05′12″N 116°01′28″W / 37.0866°N 116.0245°W / 37.0866; -116.0245 (Stokes)</a></td><td>1,250 m (4,100 ft) + 460 m (1,510 ft)</td><td>balloon,weapons development</td><td><a href="/facts/W30_(nuclear_warhead)/p3zffuxr">XW-30</a></td><td>19 kt</td><td>I-131 venting detected, 2.8 MCi (100 PBq)</td><td><a class="footnote-ref" id="fnref:88" href="#fn:88">88</a><a class="footnote-ref" id="fnref:89" href="#fn:89">89</a><a class="footnote-ref" id="fnref:90" href="#fn:90">90</a><a class="footnote-ref" id="fnref:91" href="#fn:91">91</a><a class="footnote-ref" id="fnref:92" href="#fn:92">92</a><a class="footnote-ref" id="fnref:93" href="#fn:93">93</a></td><td><a href="/facts/Tactical_Atomic_Demolition_Munition/X9not4QN">Tactical Atomic Demolition Munition</a> (TADM) and Talos SAM warhead.</td></tr><tr><th>Saturn</th><td>August 10, 1957 00:59:55.1</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area U12c.02 <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.19355_N_116.20059_W_&title=Saturn">37°11′37″N 116°12′02″W / 37.19355°N 116.20059°W / 37.19355; -116.20059 (Saturn)</a></td><td>1,231 m (4,039 ft)–39.01 m (128.0 ft)</td><td>tunnel,safety experiment</td><td><a href="/facts/W45_(nuclear_warhead)/G19lRNRj">XW-45X1</a></td><td>50 kg</td><td></td><td><a class="footnote-ref" id="fnref:94" href="#fn:94">94</a><a class="footnote-ref" id="fnref:95" href="#fn:95">95</a><a class="footnote-ref" id="fnref:96" href="#fn:96">96</a><a class="footnote-ref" id="fnref:97" href="#fn:97">97</a><a class="footnote-ref" id="fnref:98" href="#fn:98">98</a></td><td><a href="/facts/Nuclear_weapons_design/gw0LEc74">One-point safety experiment</a>; first shot in a Rainier tunnel.</td></tr><tr><th>Shasta</th><td>August 18, 1957 12:00:00.0</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area 2a <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.128_N_116.1073_W_&title=Shasta">37°07′41″N 116°06′26″W / 37.128°N 116.1073°W / 37.128; -116.1073 (Shasta)</a></td><td>1,339 m (4,393 ft) + 150 m (490 ft)</td><td>tower,weapons development</td><td>Swan</td><td>17 kt</td><td>I-131 venting detected, 2.5 MCi (93 PBq)</td><td><a class="footnote-ref" id="fnref:99" href="#fn:99">99</a><a class="footnote-ref" id="fnref:100" href="#fn:100">100</a><a class="footnote-ref" id="fnref:101" href="#fn:101">101</a><a class="footnote-ref" id="fnref:102" href="#fn:102">102</a><a class="footnote-ref" id="fnref:103" href="#fn:103">103</a></td><td>2 stage thermonuclear design.</td></tr><tr><th>Doppler</th><td>August 23, 1957 12:30:00.1</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area B7b ~ <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.0866_N_116.0245_W_&title=Doppler">37°05′12″N 116°01′28″W / 37.0866°N 116.0245°W / 37.0866; -116.0245 (Doppler)</a></td><td>1,282 m (4,206 ft) + 460 m (1,510 ft)</td><td>balloon,weapons development</td><td><a href="/facts/W34_(nuclear_warhead)/2uugxdbs">XW-34</a> ?</td><td>11 kt</td><td>I-131 venting detected, 1.7 MCi (63 PBq)</td><td><a class="footnote-ref" id="fnref:104" href="#fn:104">104</a><a class="footnote-ref" id="fnref:105" href="#fn:105">105</a><a class="footnote-ref" id="fnref:106" href="#fn:106">106</a><a class="footnote-ref" id="fnref:107" href="#fn:107">107</a><a class="footnote-ref" id="fnref:108" href="#fn:108">108</a><a class="footnote-ref" id="fnref:109" href="#fn:109">109</a></td><td>LASL gas boosted implosion device, possible XW-34 test.</td></tr><tr><th>Pascal-B</th><td>August 27, 1957 22:35:00.0</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area U3d <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.04903_N_116.0347_W_&title=Pascal-B">37°02′57″N 116°02′05″W / 37.04903°N 116.0347°W / 37.04903; -116.0347 (Pascal-B)</a></td><td>1,229 m (4,032 ft)–150 m (490 ft)</td><td>underground shaft,safety experiment</td><td></td><td>300 t</td><td></td><td><a class="footnote-ref" id="fnref:110" href="#fn:110">110</a><a class="footnote-ref" id="fnref:111" href="#fn:111">111</a><a class="footnote-ref" id="fnref:112" href="#fn:112">112</a><a class="footnote-ref" id="fnref:113" href="#fn:113">113</a><a class="footnote-ref" id="fnref:114" href="#fn:114">114</a></td><td>Shaft safety experiment, failed. Sent the shaft cap weighing several hundred pounds (1 ton) at velocity very roughly pre-calculated as 66 km/s (41 mi/s); popular claims of it reaching space are disputed, see section above.</td></tr><tr><th>Franklin Prime</th><td>August 30, 1957 12:39:59.9</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area B7b ~ <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.0866_N_116.0245_W_&title=Franklin+Prime">37°05′12″N 116°01′28″W / 37.0866°N 116.0245°W / 37.0866; -116.0245 (Franklin Prime)</a></td><td>1,282 m (4,206 ft) + 230 m (750 ft)</td><td>balloon,weapons development</td><td></td><td>4.7 kt</td><td>I-131 venting detected, 690 kCi (26,000 TBq)</td><td><a class="footnote-ref" id="fnref:115" href="#fn:115">115</a><a class="footnote-ref" id="fnref:116" href="#fn:116">116</a><a class="footnote-ref" id="fnref:117" href="#fn:117">117</a><a class="footnote-ref" id="fnref:118" href="#fn:118">118</a><a class="footnote-ref" id="fnref:119" href="#fn:119">119</a><a class="footnote-ref" id="fnref:120" href="#fn:120">120</a></td><td>Retest of Franklin with more U-235.</td></tr><tr><th>Smoky</th><td>August 31, 1957 12:30:00.0</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area T2c <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.18712_N_116.06887_W_&title=Smoky">37°11′14″N 116°04′08″W / 37.18712°N 116.06887°W / 37.18712; -116.06887 (Smoky)</a></td><td>1,367 m (4,485 ft) + 210 m (690 ft)</td><td>tower,weapons development</td><td><a href="/facts/B41_nuclear_bomb/bNSostjy">TX-41</a> primary</td><td>44 kt</td><td>I-131 venting detected, 6.4 MCi (240 PBq)</td><td><a class="footnote-ref" id="fnref:121" href="#fn:121">121</a><a class="footnote-ref" id="fnref:122" href="#fn:122">122</a><a class="footnote-ref" id="fnref:123" href="#fn:123">123</a><a class="footnote-ref" id="fnref:124" href="#fn:124">124</a><a class="footnote-ref" id="fnref:125" href="#fn:125">125</a><a class="footnote-ref" id="fnref:126" href="#fn:126">126</a><a class="footnote-ref" id="fnref:127" href="#fn:127">127</a></td><td>2 stages of 3 stage thermonuke, similar to Redwing/Zuni and Tewa. Desert Rock VII; 3000 servicemen irradiated; 10 of 4 expected leukemia cases in the 80s. Last pristine air-drop location at the NTS.</td></tr><tr><th>Galileo</th><td>September 2, 1957 12:40:00.0</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area T1 <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.053_N_116.1034_W_&title=Galileo">37°03′11″N 116°06′12″W / 37.053°N 116.1034°W / 37.053; -116.1034 (Galileo)</a></td><td>1,294 m (4,245 ft) + 150 m (490 ft)</td><td>tower,weapons development</td><td></td><td>11 kt</td><td>I-131 venting detected, 1.9 MCi (70 PBq)</td><td><a class="footnote-ref" id="fnref:128" href="#fn:128">128</a><a class="footnote-ref" id="fnref:129" href="#fn:129">129</a><a class="footnote-ref" id="fnref:130" href="#fn:130">130</a><a class="footnote-ref" id="fnref:131" href="#fn:131">131</a><a class="footnote-ref" id="fnref:132" href="#fn:132">132</a></td><td>LASL diagnostic/exploratory test of boosted fission device. Desert Rock VIII.</td></tr><tr><th>Wheeler</th><td>September 6, 1957 12:45:00.0</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area B9a ~ <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.1347_N_116.0417_W_&title=Wheeler">37°08′05″N 116°02′30″W / 37.1347°N 116.0417°W / 37.1347; -116.0417 (Wheeler)</a></td><td>1,286 m (4,219 ft) + 150 m (490 ft)</td><td>balloon,weapons development</td><td><a href="/facts/XW-51/VEur1nxJ">XW-51</a> ?</td><td>197 t</td><td>I-131 venting detected, 27 kCi (1,000 TBq)</td><td><a class="footnote-ref" id="fnref:133" href="#fn:133">133</a><a class="footnote-ref" id="fnref:134" href="#fn:134">134</a><a class="footnote-ref" id="fnref:135" href="#fn:135">135</a><a class="footnote-ref" id="fnref:136" href="#fn:136">136</a><a class="footnote-ref" id="fnref:137" href="#fn:137">137</a></td><td>Retest of redesigned Lassen device, possible XW-51 air-to-air warhead progenitor.</td></tr><tr><th>Coulomb-B</th><td>September 6, 1957 20:05:00.6</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area S3g <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.0427_N_116.0277_W_&title=Coulomb-B">37°02′34″N 116°01′40″W / 37.0427°N 116.0277°W / 37.0427; -116.0277 (Coulomb-B)</a></td><td>1,225 m (4,019 ft) + 0</td><td>dry surface,safety experiment</td><td><a href="/facts/W31/Q3wJU98g">XW-31</a></td><td>300 t</td><td>I-131 venting detected, 42 kCi (1,600 TBq)</td><td><a class="footnote-ref" id="fnref:138" href="#fn:138">138</a><a class="footnote-ref" id="fnref:139" href="#fn:139">139</a><a class="footnote-ref" id="fnref:140" href="#fn:140">140</a><a class="footnote-ref" id="fnref:141" href="#fn:141">141</a><a class="footnote-ref" id="fnref:142" href="#fn:142">142</a></td><td>One-point safety experiment, high limits test, expected 1 kg TNT equivalent, max .2 kt - failure.</td></tr><tr><th>Laplace</th><td>September 8, 1957 12:59:59.8</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area B7b ~ <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.0866_N_116.0245_W_&title=Laplace">37°05′12″N 116°01′28″W / 37.0866°N 116.0245°W / 37.0866; -116.0245 (Laplace)</a></td><td>1,282 m (4,206 ft) + 230 m (750 ft)</td><td>balloon,weapons development</td><td><a href="/facts/W33_(nuclear_weapon)/71CLAzEM">XW-33</a> "Fleegle"</td><td>1 kt</td><td>I-131 venting detected, 140 kCi (5,200 TBq)</td><td><a class="footnote-ref" id="fnref:143" href="#fn:143">143</a><a class="footnote-ref" id="fnref:144" href="#fn:144">144</a><a class="footnote-ref" id="fnref:145" href="#fn:145">145</a><a class="footnote-ref" id="fnref:146" href="#fn:146">146</a></td><td>Oralloy gun-type device, for a nuclear artillery shell. The third of only four gun-type weapons, with Little Boy, Grable and Aardvark.</td></tr><tr><th>Fizeau</th><td>September 14, 1957 16:44:59.8</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area T3b <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.0336_N_116.0323_W_&title=Fizeau">37°02′01″N 116°01′56″W / 37.0336°N 116.0323°W / 37.0336; -116.0323 (Fizeau)</a></td><td>1,220 m (4,000 ft) + 150 m (490 ft)</td><td>tower,weapons development</td><td><a href="/facts/W34_(nuclear_warhead)/2uugxdbs">XW-34</a> ?</td><td>11 kt</td><td>I-131 venting detected, 1.7 MCi (63 PBq)</td><td><a class="footnote-ref" id="fnref:147" href="#fn:147">147</a><a class="footnote-ref" id="fnref:148" href="#fn:148">148</a><a class="footnote-ref" id="fnref:149" href="#fn:149">149</a><a class="footnote-ref" id="fnref:150" href="#fn:150">150</a><a class="footnote-ref" id="fnref:151" href="#fn:151">151</a><a class="footnote-ref" id="fnref:152" href="#fn:152">152</a></td><td>LASL boosted fission device. Possibly a test of the XW-34 depth bomb.</td></tr><tr><th>Newton</th><td>September 16, 1957 12:49:59.9</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area B7a ~ <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.0866_N_116.0245_W_&title=Newton">37°05′12″N 116°01′28″W / 37.0866°N 116.0245°W / 37.0866; -116.0245 (Newton)</a></td><td>1,282 m (4,206 ft) + 460 m (1,510 ft)</td><td>balloon,weapons development</td><td><a href="/facts/W31/Q3wJU98g">XW-31</a></td><td>12 kt</td><td>I-131 venting detected, 2.1 MCi (78 PBq)</td><td><a class="footnote-ref" id="fnref:153" href="#fn:153">153</a><a class="footnote-ref" id="fnref:154" href="#fn:154">154</a><a class="footnote-ref" id="fnref:155" href="#fn:155">155</a><a class="footnote-ref" id="fnref:156" href="#fn:156">156</a><a class="footnote-ref" id="fnref:157" href="#fn:157">157</a><a class="footnote-ref" id="fnref:158" href="#fn:158">158</a></td><td>LASL test of XW-31 variant, boosted primary in thermonuclear system mockup. Sounds like a fizzle, but no one says so.</td></tr><tr><th>Rainier</th><td>September 19, 1957 16:59:59.45</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area U12b <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.19573_N_116.20404_W_&title=Rainier">37°11′45″N 116°12′15″W / 37.19573°N 116.20404°W / 37.19573; -116.20404 (Rainier)</a></td><td>2,295 m (7,530 ft)–272.8 m (895 ft)</td><td>tunnel,weapons development</td><td><a href="/facts/W25_(nuclear_warhead)/s95LBoWX">W-25</a></td><td>1.7 kt</td><td></td><td><a class="footnote-ref" id="fnref:159" href="#fn:159">159</a><a class="footnote-ref" id="fnref:160" href="#fn:160">160</a><a class="footnote-ref" id="fnref:161" href="#fn:161">161</a><a class="footnote-ref" id="fnref:162" href="#fn:162">162</a><a class="footnote-ref" id="fnref:163" href="#fn:163">163</a><a class="footnote-ref" id="fnref:164" href="#fn:164">164</a><a class="footnote-ref" id="fnref:165" href="#fn:165">165</a></td><td>First US underground nuclear test. Evaluate containment and detection of underground testing, formed a chimney of broken rock which provided data on possible underground engineering applications of nuclear explosives.</td></tr><tr><th>Whitney</th><td>September 23, 1957 12:29:59.8</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area T2 <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.1383_N_116.1184_W_&title=Whitney">37°08′18″N 116°07′06″W / 37.1383°N 116.1184°W / 37.1383; -116.1184 (Whitney)</a></td><td>1,370 m (4,490 ft) + 150 m (490 ft)</td><td>tower,weapons development</td><td><a href="/facts/W27_warhead/nq1Efj1a">W27</a> primary</td><td>19 kt</td><td>I-131 venting detected, 2.9 MCi (110 PBq)</td><td><a class="footnote-ref" id="fnref:166" href="#fn:166">166</a><a class="footnote-ref" id="fnref:167" href="#fn:167">167</a><a class="footnote-ref" id="fnref:168" href="#fn:168">168</a><a class="footnote-ref" id="fnref:169" href="#fn:169">169</a><a class="footnote-ref" id="fnref:170" href="#fn:170">170</a></td><td>Test of boosted Swan primary in W-27 thermonuclear system mockup.</td></tr><tr><th>Charleston</th><td>September 28, 1957 12:59:59.9</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area B9a ~ <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.1347_N_116.0417_W_&title=Charleston">37°08′05″N 116°02′30″W / 37.1347°N 116.0417°W / 37.1347; -116.0417 (Charleston)</a></td><td>1,285 m (4,216 ft) + 460 m (1,510 ft)</td><td>balloon,weapons development</td><td></td><td>12 kt</td><td>I-131 venting detected, 1.8 MCi (67 PBq)</td><td><a class="footnote-ref" id="fnref:171" href="#fn:171">171</a><a class="footnote-ref" id="fnref:172" href="#fn:172">172</a><a class="footnote-ref" id="fnref:173" href="#fn:173">173</a><a class="footnote-ref" id="fnref:174" href="#fn:174">174</a><a class="footnote-ref" id="fnref:175" href="#fn:175">175</a></td><td>UCRL test of a small "clean" tactical 2-stage thermonuclear device. Device fizzled when second stage failed to fire.</td></tr><tr><th>Morgan</th><td>October 7, 1957 13:00:00.1</td><td><a href="/facts/Nevada_National_Security_Site/eWg04MIr">NTS</a> Area B9a ~ <a href="https://geohack.toolforge.org/geohack.php?pagename=Operation_Plumbbob¶ms=37.1347_N_116.0417_W_&title=Morgan">37°08′05″N 116°02′30″W / 37.1347°N 116.0417°W / 37.1347; -116.0417 (Morgan)</a></td><td>1,285 m (4,216 ft) + 150 m (490 ft)</td><td>balloon,weapons development</td><td><a href="/facts/W45_(nuclear_warhead)/G19lRNRj">XW-45X1</a> Swan/Flamingo</td><td>8 kt</td><td>I-131 venting detected, 1.2 MCi (44 PBq)</td><td><a class="footnote-ref" id="fnref:176" href="#fn:176">176</a><a class="footnote-ref" id="fnref:177" href="#fn:177">177</a><a class="footnote-ref" id="fnref:178" href="#fn:178">178</a><a class="footnote-ref" id="fnref:179" href="#fn:179">179</a><a class="footnote-ref" id="fnref:180" href="#fn:180">180</a></td><td></td></tr></tbody></table>
<h2 id="gallery">Gallery</h2>

<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Lists_of_nuclear_disasters_and_radioactive_incidents/N8oN5dYT">Lists of nuclear disasters and radioactive incidents</a></li>
<li><a href="/facts/Totskoye_nuclear_exercise/5RdqRSl6">Totskoye nuclear exercise</a></li></ul>
<h2 id="notes">Notes</h2>

<h2 id="external-links">External links</h2>

Wikimedia Commons has media related to Operation Plumbbob.

<ul><li>Video clips: <a href="http://www.criticalpast.com/video/65675046804_Nuclear-test_desert-floor_obscured-by-brightness_fireball-and-smoke">Historic color footage of shot "Owens"</a>, <a href="https://www.youtube.com/watch?v=szbb00ncNNs">Rainier</a> on <a href="/facts/YouTube_video_(identifier)/db276jst">YouTube</a> during Operation Plumbbob</li>
<li><a href="http://nuclearweaponarchive.org/Usa/Tests/Plumbob.html">Plumbbob page</a> on the Nuclear Weapons Archive (also refers to manhole cover issue mentioned above).</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1">Yang, Xiaoping; North, Robert; Romney, Carl (August 2000), CMR Nuclear Explosion Database (Revision 3), SMDC Monitoring Research <a href="#fnref:1" class="footnote-back-ref">↩</a></li>
<li id="fn:2">Judy Irving, Chris Beaver, Ruth Landy (directors) (March 27, 2007). Dark Circle (DVD). ISBN 0-7670-9304-6. Archived from the original on August 11, 2019. Retrieved September 7, 2017. <a href="0-7670-9304-6" target="_blank">0-7670-9304-6</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></li>
<li id="fn:3">Robert Krulwich (July 17, 2012). "Five Men Agree To Stand Directly Under An Exploding Nuclear Bomb". NPR. Archived from the original on April 26, 2015. Retrieved April 3, 2018. <a href="https://www.npr.org/blogs/krulwich/2012/07/16/156851175/five-men-agree-to-stand-directly-under-an-exploding-nuclear-bomb" target="_blank">https://www.npr.org/blogs/krulwich/2012/07/16/156851175/five-men-agree-to-stand-directly-under-an-exploding-nuclear-bomb</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></li>
<li id="fn:4">Timothy Stenovec (July 20, 2012). "George Yoshitake, Nuclear Test Photographer, Recalls Filming Nuclear Blast 55 Years Ago". Huffington Post. Archived from the original on December 14, 2012. Retrieved July 22, 2013. <a href="http://www.huffingtonpost.com/2012/07/20/george-yoshitake-nuclear-test-five-5-men-nevada_n_1687233.html" target="_blank">http://www.huffingtonpost.com/2012/07/20/george-yoshitake-nuclear-test-five-5-men-nevada_n_1687233.html</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></li>
<li id="fn:5">"Donald Allen Luttrell (obituary)". Dallas Morning News. January 1, 2015. Archived from the original on March 3, 2016. Retrieved February 15, 2015. <a href="http://www.legacy.com/obituaries/dallasmorningnews/obituary.aspx?pid=173687969" target="_blank">http://www.legacy.com/obituaries/dallasmorningnews/obituary.aspx?pid=173687969</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></li>
<li id="fn:6">"Akira "George" Yoshitake (obituary)". Lompoc Record. Lompoc, California, US. October 22, 2013. Archived from the original on June 14, 2017. Retrieved May 17, 2014. <a href="http://www.lompocrecord.com/lifestyles/announcements/obituaries/akira-george-yoshitake/article_e7d7490d-8347-5fab-a8ed-6e0adf725271.html" target="_blank">http://www.lompocrecord.com/lifestyles/announcements/obituaries/akira-george-yoshitake/article_e7d7490d-8347-5fab-a8ed-6e0adf725271.html</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></li>
<li id="fn:7">Sublette, Carey. "Operation Plumbbob". Nuclear Weapon Archive. Archived from the original on December 13, 2003. Retrieved December 27, 2006. <a href="http://nuclearweaponarchive.org/Usa/Tests/Plumbob.html" target="_blank">http://nuclearweaponarchive.org/Usa/Tests/Plumbob.html</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></li>
<li id="fn:8">Thomson, Iain (July 16, 2015). "Science: Did speeding American manhole cover beat Sputnik into space? Top boffin speaks to El Reg - How a nuke blast lid may have beaten Soviets by months". The Register. Archived from the original on May 7, 2021. Retrieved June 11, 2021. <a href="https://www.theregister.com/2015/07/16/america_soviets_space_race/" target="_blank">https://www.theregister.com/2015/07/16/america_soviets_space_race/</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></li>
<li id="fn:9">Thomson, Iain (July 16, 2015). "Science: Did speeding American manhole cover beat Sputnik into space? Top boffin speaks to El Reg - How a nuke blast lid may have beaten Soviets by months". The Register. Archived from the original on May 7, 2021. Retrieved June 11, 2021. <a href="https://www.theregister.com/2015/07/16/america_soviets_space_race/" target="_blank">https://www.theregister.com/2015/07/16/america_soviets_space_race/</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></li>
<li id="fn:10">Harrington, Rebecca (February 5, 2016). "The fastest object ever launched was a manhole cover – here's the story from the guy who shot it into space". Tech Insider - www.businessinsider.com Business Insider. Archived from the original on November 1, 2020. Retrieved June 11, 2021. <a href="https://www.businessinsider.com/fastest-object-robert-brownlee-2016-2?r=US&IR=T#brownlee-wanted-to-measure-how-fast-the-iron-cap-flew-off-the-column-so-he-designed-a-second-experiment-pascal-b-9" target="_blank">https://www.businessinsider.com/fastest-object-robert-brownlee-2016-2?r=US&IR=T#brownlee-wanted-to-measure-how-fast-the-iron-cap-flew-off-the-column-so-he-designed-a-second-experiment-pascal-b-9</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></li>
<li id="fn:11">Thomson, Iain (July 16, 2015). "Science: Did speeding American manhole cover beat Sputnik into space? Top boffin speaks to El Reg - How a nuke blast lid may have beaten Soviets by months". The Register. Archived from the original on May 7, 2021. Retrieved June 11, 2021. <a href="https://www.theregister.com/2015/07/16/america_soviets_space_race/" target="_blank">https://www.theregister.com/2015/07/16/america_soviets_space_race/</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></li>
<li id="fn:12">Brownlee, Robert R. (June 2002). "Learning to Contain Underground Nuclear Explosions". Retrieved July 31, 2006. <a href="http://nuclearweaponarchive.org/Usa/Tests/Brownlee.html" target="_blank">http://nuclearweaponarchive.org/Usa/Tests/Brownlee.html</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></li>
<li id="fn:13">Thomson, Iain (July 16, 2015). "Science: Did speeding American manhole cover beat Sputnik into space? Top boffin speaks to El Reg - How a nuke blast lid may have beaten Soviets by months". The Register. Archived from the original on May 7, 2021. Retrieved June 11, 2021. <a href="https://www.theregister.com/2015/07/16/america_soviets_space_race/" target="_blank">https://www.theregister.com/2015/07/16/america_soviets_space_race/</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></li>
<li id="fn:14">Thomson, Iain (July 16, 2015). "Science: Did speeding American manhole cover beat Sputnik into space? Top boffin speaks to El Reg - How a nuke blast lid may have beaten Soviets by months". The Register. Archived from the original on May 7, 2021. Retrieved June 11, 2021. <a href="https://www.theregister.com/2015/07/16/america_soviets_space_race/" target="_blank">https://www.theregister.com/2015/07/16/america_soviets_space_race/</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></li>
<li id="fn:15">Brownlee, Robert R. (June 2002). "Learning to Contain Underground Nuclear Explosions". Retrieved July 31, 2006. <a href="http://nuclearweaponarchive.org/Usa/Tests/Brownlee.html" target="_blank">http://nuclearweaponarchive.org/Usa/Tests/Brownlee.html</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></li>
<li id="fn:16">Brownlee, Robert R. (June 2002). "Learning to Contain Underground Nuclear Explosions". Retrieved July 31, 2006. <a href="http://nuclearweaponarchive.org/Usa/Tests/Brownlee.html" target="_blank">http://nuclearweaponarchive.org/Usa/Tests/Brownlee.html</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></li>
<li id="fn:17">To convert the UT into standard local PST, subtract 8 hours. If the result is earlier than 00:00, add 24 hours and subtract 1 from the day. Historical time zone data are derived from "Time Zone Historical Database". iana.com. Archived from the original on March 11, 2014. Retrieved March 8, 2014. <a href="http://www.ietf.org/timezones/" target="_blank">http://www.ietf.org/timezones/</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></li>
<li id="fn:18">Rough place name and a latitude/longitude reference; for rocket-carried tests, the launch location is specified before the detonation location, if known. Some locations are extremely accurate; others (like airdrops and space blasts) may be quite inaccurate. "~" indicates a likely pro-forma rough location, shared with other tests in that same area. <a href="#fnref:18" class="footnote-back-ref">↩</a></li>
<li id="fn:19">Elevation is the ground level at the point directly below the explosion relative to sea level; height is the additional distance added or by tower, balloon, shaft, tunnel, air drop or other contrivance. For rocket bursts the ground level is "N/A". In some cases it is not clear if the height is absolute or relative to ground, for example, Plumbbob/John. No number or units indicates the value is unknown, while "0" means zero. Sorting on this column is by elevation and height added together. <a href="#fnref:19" class="footnote-back-ref">↩</a></li>
<li id="fn:20">Atmospheric, airdrop, balloon, gun, cruise missile, rocket, surface, tower, and barge have all been disallowed by the Partial Nuclear Test Ban Treaty since 1963. Sealed shaft and tunnel are underground, and remained useful under the PTBT. Intentional cratering tests are borderline; they occurred under the treaty, were sometimes protested, and generally overlooked if the test was declared to be a peaceful use. <a href="/wiki/Partial_Nuclear_Test_Ban_Treaty" target="_blank">/wiki/Partial_Nuclear_Test_Ban_Treaty</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></li>
<li id="fn:21">Include weapons development, weapon effects, safety test, transport safety test, war, science, joint verification and industrial/peaceful, which may be further broken down. <a href="#fnref:21" class="footnote-back-ref">↩</a></li>
<li id="fn:22">Designations for test items where known, "?" indicates some uncertainty about the preceding value, nicknames for particular devices in quotes. This category of information is often not officially disclosed. <a href="#fnref:22" class="footnote-back-ref">↩</a></li>
<li id="fn:23">Estimated energy yield in tons or kilotons. A ton of TNT equivalent is defined as 4.184 gigajoules (1 gigacalorie). <a href="/wiki/TNT_equivalent" target="_blank">/wiki/TNT_equivalent</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></li>
<li id="fn:24">Radioactive emission to the atmosphere aside from prompt neutrons, where known. The measured species is only iodine 131 if mentioned, otherwise it is all species. No entry means unknown, probably none if underground and "all" if not; otherwise notation for whether measured on the site only or off the site, where known, and the measured amount of radioactivity released. <a href="/wiki/Iodine_131" target="_blank">/wiki/Iodine_131</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></li>
<li id="fn:25">Yang, Xiaoping; North, Robert; Romney, Carl (August 2000), CMR Nuclear Explosion Database (Revision 3), SMDC Monitoring Research <a href="#fnref:25" class="footnote-back-ref">↩</a></li>
<li id="fn:26">Harris, P.S.; Lowery, C.; Nelson, A. (1981), Plumbbob Series, 1957 Final (PDF) (DNA6005F), Defense Nuclear Agency, archived (PDF) from the original on January 11, 2014, retrieved January 6, 2014 <a href="http://apps.dtic.mil/dtic/tr/fulltext/u2/a107317.pdf" target="_blank">http://apps.dtic.mil/dtic/tr/fulltext/u2/a107317.pdf</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></li>
<li id="fn:27">"2", Estimated exposures and thyroid doses received by the American people from Iodine-131 in fallout following Nevada atmospheric nuclear bomb tests, National Cancer Institute, 1997, archived from the original on February 1, 2017, retrieved January 5, 2014 <a href="https://www.cancer.gov/about-cancer/causes-prevention/risk/radiation/i131-report-and-appendix" target="_blank">https://www.cancer.gov/about-cancer/causes-prevention/risk/radiation/i131-report-and-appendix</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></li>
<li id="fn:28">Sublette, Carey, Nuclear Weapons Archive, retrieved January 6, 2014 <a href="http://www.nuclearweaponarchive.org/Usa/Tests" target="_blank">http://www.nuclearweaponarchive.org/Usa/Tests</a> <a href="#fnref:28" class="footnote-back-ref">↩</a></li>
<li id="fn:29">Hansen, Chuck (1995), The Swords of Armageddon, Vol. 8, Sunnyvale, CA: Chukelea Publications, ISBN 978-0-9791915-1-0 <a href="978-0-9791915-1-0" target="_blank">978-0-9791915-1-0</a> <a href="#fnref:29" class="footnote-back-ref">↩</a></li>
<li id="fn:30">United States Nuclear Tests: July 1945 through September 1992 (PDF) (DOE/NV-209 REV15), Las Vegas, NV: Department of Energy, Nevada Operations Office, December 1, 2000, archived from the original (PDF) on October 12, 2006, retrieved December 18, 2013 <a href="https://web.archive.org/web/20061012160826/http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf" target="_blank">https://web.archive.org/web/20061012160826/http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf</a> <a href="#fnref:30" class="footnote-back-ref">↩</a></li>
<li id="fn:31">Yang, Xiaoping; North, Robert; Romney, Carl (August 2000), CMR Nuclear Explosion Database (Revision 3), SMDC Monitoring Research <a href="#fnref:31" class="footnote-back-ref">↩</a></li>
<li id="fn:32">Harris, P.S.; Lowery, C.; Nelson, A. (1981), Plumbbob Series, 1957 Final (PDF) (DNA6005F), Defense Nuclear Agency, archived (PDF) from the original on January 11, 2014, retrieved January 6, 2014 <a href="http://apps.dtic.mil/dtic/tr/fulltext/u2/a107317.pdf" target="_blank">http://apps.dtic.mil/dtic/tr/fulltext/u2/a107317.pdf</a> <a href="#fnref:32" class="footnote-back-ref">↩</a></li>
<li id="fn:33">"2", Estimated exposures and thyroid doses received by the American people from Iodine-131 in fallout following Nevada atmospheric nuclear bomb tests, National Cancer Institute, 1997, archived from the original on February 1, 2017, retrieved January 5, 2014 <a href="https://www.cancer.gov/about-cancer/causes-prevention/risk/radiation/i131-report-and-appendix" target="_blank">https://www.cancer.gov/about-cancer/causes-prevention/risk/radiation/i131-report-and-appendix</a> <a href="#fnref:33" class="footnote-back-ref">↩</a></li>
<li id="fn:34">Sublette, Carey, Nuclear Weapons Archive, retrieved January 6, 2014 <a href="http://www.nuclearweaponarchive.org/Usa/Tests" target="_blank">http://www.nuclearweaponarchive.org/Usa/Tests</a> <a href="#fnref:34" class="footnote-back-ref">↩</a></li>
<li id="fn:35">Hansen, Chuck (1995), The Swords of Armageddon, Vol. 8, Sunnyvale, CA: Chukelea Publications, ISBN 978-0-9791915-1-0 <a href="978-0-9791915-1-0" target="_blank">978-0-9791915-1-0</a> <a href="#fnref:35" class="footnote-back-ref">↩</a></li>
<li id="fn:36">United States Nuclear Tests: July 1945 through September 1992 (PDF) (DOE/NV-209 REV15), Las Vegas, NV: Department of Energy, Nevada Operations Office, December 1, 2000, archived from the original (PDF) on October 12, 2006, retrieved December 18, 2013 <a href="https://web.archive.org/web/20061012160826/http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf" target="_blank">https://web.archive.org/web/20061012160826/http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf</a> <a href="#fnref:36" class="footnote-back-ref">↩</a></li>
<li id="fn:37">Yang, Xiaoping; North, Robert; Romney, Carl (August 2000), CMR Nuclear Explosion Database (Revision 3), SMDC Monitoring Research <a href="#fnref:37" class="footnote-back-ref">↩</a></li>
<li id="fn:38">Harris, P.S.; Lowery, C.; Nelson, A. (1981), Plumbbob Series, 1957 Final (PDF) (DNA6005F), Defense Nuclear Agency, archived (PDF) from the original on January 11, 2014, retrieved January 6, 2014 <a href="http://apps.dtic.mil/dtic/tr/fulltext/u2/a107317.pdf" target="_blank">http://apps.dtic.mil/dtic/tr/fulltext/u2/a107317.pdf</a> <a href="#fnref:38" class="footnote-back-ref">↩</a></li>
<li id="fn:39">"2", Estimated exposures and thyroid doses received by the American people from Iodine-131 in fallout following Nevada atmospheric nuclear bomb tests, National Cancer Institute, 1997, archived from the original on February 1, 2017, retrieved January 5, 2014 <a href="https://www.cancer.gov/about-cancer/causes-prevention/risk/radiation/i131-report-and-appendix" target="_blank">https://www.cancer.gov/about-cancer/causes-prevention/risk/radiation/i131-report-and-appendix</a> <a href="#fnref:39" class="footnote-back-ref">↩</a></li>
<li id="fn:40">United States Nuclear Tests: July 1945 through September 1992 (PDF) (DOE/NV-209 REV15), Las Vegas, NV: Department of Energy, Nevada Operations Office, December 1, 2000, archived from the original (PDF) on October 12, 2006, retrieved December 18, 2013 <a href="https://web.archive.org/web/20061012160826/http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf" target="_blank">https://web.archive.org/web/20061012160826/http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf</a> <a href="#fnref:40" class="footnote-back-ref">↩</a></li>
<li id="fn:41">Yang, Xiaoping; North, Robert; Romney, Carl (August 2000), CMR Nuclear Explosion Database (Revision 3), SMDC Monitoring Research <a href="#fnref:41" class="footnote-back-ref">↩</a></li>
<li id="fn:42">Harris, P.S.; Lowery, C.; Nelson, A. (1981), Plumbbob Series, 1957 Final (PDF) (DNA6005F), Defense Nuclear Agency, archived (PDF) from the original on January 11, 2014, retrieved January 6, 2014 <a href="http://apps.dtic.mil/dtic/tr/fulltext/u2/a107317.pdf" target="_blank">http://apps.dtic.mil/dtic/tr/fulltext/u2/a107317.pdf</a> <a href="#fnref:42" class="footnote-back-ref">↩</a></li>
<li id="fn:43">"2", Estimated exposures and thyroid doses received by the American people from Iodine-131 in fallout following Nevada atmospheric nuclear bomb tests, National Cancer Institute, 1997, archived from the original on February 1, 2017, retrieved January 5, 2014 <a href="https://www.cancer.gov/about-cancer/causes-prevention/risk/radiation/i131-report-and-appendix" target="_blank">https://www.cancer.gov/about-cancer/causes-prevention/risk/radiation/i131-report-and-appendix</a> <a href="#fnref:43" class="footnote-back-ref">↩</a></li>
<li id="fn:44">Hansen, Chuck (1995), The Swords of Armageddon, Vol. 8, Sunnyvale, CA: Chukelea Publications, ISBN 978-0-9791915-1-0 <a href="978-0-9791915-1-0" target="_blank">978-0-9791915-1-0</a> <a href="#fnref:44" class="footnote-back-ref">↩</a></li>
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<li id="fn:167">Harris, P.S.; Lowery, C.; Nelson, A. (1981), Plumbbob Series, 1957 Final (PDF) (DNA6005F), Defense Nuclear Agency, archived (PDF) from the original on January 11, 2014, retrieved January 6, 2014 <a href="http://apps.dtic.mil/dtic/tr/fulltext/u2/a107317.pdf" target="_blank">http://apps.dtic.mil/dtic/tr/fulltext/u2/a107317.pdf</a> <a href="#fnref:167" class="footnote-back-ref">↩</a></li>
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<li id="fn:169">Hansen, Chuck (1995), The Swords of Armageddon, Vol. 8, Sunnyvale, CA: Chukelea Publications, ISBN 978-0-9791915-1-0 <a href="978-0-9791915-1-0" target="_blank">978-0-9791915-1-0</a> <a href="#fnref:169" class="footnote-back-ref">↩</a></li>
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</ol>

Operation Plumbbob open-in-new

Operation Plumbbob