![]() This time, for Pascal-B, Brownlee recorded the experiment with a camera that shot one frame per millisecond, which revealed the cover could have reached a top speed of 125,000 mph (201,000 km/h). ![]() ![]() To further test what happened to the maintenance hole, Brownlee repeated the experiment on Aug. Brownlee had expected that the cover would land back on Earth, but it was never recovered. The force of the explosion "inevitably" blew the maintenance hole into the sky, Robert Brownlee, an astrophysicist at Los Alamos National Laboratory in New Mexico and lead scientist of the Pascal tests, told Business Insider before his death in 2018. ![]() Pascal-A was carried out July 26, 1957, when an atomic bomb detonated at the bottom of a 500-foot-deep (152 meters) hole, which was covered by a 4-inch-thick (10 centimeters) iron cover. The tests included 29 nuclear detonations, two of which, known as Pascal-A and Pascal-B, were carried out underground, to test if nuclear fallout could be contained. military carried out a series of nuclear tests in the Nevada desert in a project known as Operation Plumbbob. (Image credit: NNSA)Ä«etween May 28 and Oct. The testing site in Navada used during Operation Plumbbob. ![]()
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