THE ULTIMATE GUIDE TO UNDERWATER NUCLEAR TEST 'UMBRELLA'

With test moratoriums around the horizon, American weapons labs rushed out quite a few new styles. A hard deadline for testing was set at midnight (0000 hrs), 31 October 1958, as negotiations ended up established to start out that day, plus the agenda reveals it, with 29 tests executed in Oct, 4 of them on the last day. One other test was cancelled