DETAILED NOTES ON UNDERWATER NUCLEAR TEST 'UMBRELLA' (1958)

With test moratoriums within 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 were being set to start out that day, as well as the program exhibits it, with 29 tests executed in Oct, 4 of them on the last day. One other test wa