TOP UNDERWATER NUCLEAR TEST 'UMBRELLA' (1958) SECRETS

With test moratoriums to the horizon, American weapons labs rushed out several new patterns. A tough deadline for testing was set at midnight (0000 hrs), 31 Oct 1958, as negotiations had been established to get started on that day, and also the plan demonstrates it, with 29 tests executed in October, four of them on the last day. One particular oth