THE ULTIMATE GUIDE TO UNDERWATER NUCLEAR TEST 'UMBRELLA'

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