TOP UNDERWATER NUCLEAR TEST 'UMBRELLA' SECRETS

With test moratoriums on the horizon, American weapons labs rushed out several new patterns. A hard deadline for testing was set at midnight (0000 hrs), 31 Oct 1958, as negotiations were established to begin that working day, and also the plan exhibits it, with 29 tests executed in Oct, 4 of them on the last day. 1 other test was cancelled mainly b