TOP UNDERWATER NUCLEAR TEST 'UMBRELLA' (1958) SECRETS

With test moratoriums over the horizon, American weapons labs rushed out a lot of new designs. A tough deadline for testing was established at midnight (0000 hrs), 31 Oct 1958, as negotiations were being established to get started on that day, as well as routine exhibits it, with 29 tests executed in October, four of them on the last day. One parti