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| Keywords: Operation Plumbbob - Lassen.jpg en PLUMBBOB/LASSSEN - LAS VEGAS NV -- Atomic cloud resulting from detonation of the first atomic device to be fired from a captive balloon is shown 5 seconds after detonation Shot was fired from a height of 500 feet 40 minutes before dawn at 4 45 a m in Yucca Flat Fallout from the test announced as well below nominal in yield was recorded only in the immediate test area Helium-filled balloon was 67 feet in diameter held in place by four steel cables winches for which are remotely controlled Photo was taken from aircraft 5 ½ miles from Ground Zero with ½ second exposure at F-8 http //www nv doe gov/library/photos/photodetails aspx ID 422 Photo courtesy of National Nuclear Security Administration / Nevada Site Office 1957-06-05 PD-USGov Plumbbob Lassen Images from the NNSA/NSO Photo Library Moored balloons | ||||
