TOP UNDERWATER NUCLEAR TEST 'UMBRELLA' (1958) SECRETS

With test moratoriums within the horizon, American weapons labs rushed out several new layouts. A tough deadline for testing was established at midnight (0000 hrs), 31 Oct 1958, as negotiations ended up established to get started on that day, as well as timetable exhibits it, with 29 tests executed in October, 4 of these on the last day. One other