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

With test moratoriums around the horizon, American weapons labs rushed out lots of new designs. A tough deadline for testing was set at midnight (0000 hrs), 31 Oct 1958, as negotiations ended up set to begin that working day, as well as program reveals it, with 29 tests executed in October, 4 of these on the last day. A person other test was cancel