NOT KNOWN FACTS ABOUT UNDERWATER NUCLEAR TEST 'UMBRELLA'

With test moratoriums on the horizon, American weapons labs rushed out quite a few new patterns. A hard deadline for testing was set at midnight (0000 hrs), 31 October 1958, as negotiations were being established to start that working day, and also the timetable displays it, with 29 tests executed in Oct, four of them on the last day. One particula