NOT KNOWN FACTS ABOUT UNDERWATER NUCLEAR TEST 'UMBRELLA'

With test moratoriums within the horizon, American weapons labs rushed out numerous new types. A tough deadline for testing was established at midnight (0000 hrs), 31 Oct 1958, as negotiations were being established to get started on that working day, and the routine exhibits it, with 29 tests executed in October, 4 of these on the final day. A per