NEW STEP BY STEP MAP FOR UNDERWATER NUCLEAR TEST 'UMBRELLA' (1958)

With test moratoriums within the horizon, American weapons labs rushed out many new layouts. A tough deadline for testing was set at midnight (0000 hrs), 31 October 1958, as negotiations ended up established to get started on that day, along with the agenda exhibits it, with 29 tests executed in Oct, four of these on the final working day. A single