TOP UNDERWATER NUCLEAR TEST 'UMBRELLA' (1958) SECRETS

With test moratoriums to the horizon, American weapons labs rushed out several new patterns. A hard deadline for testing was established at midnight (0000 hrs), 31 Oct 1958, as negotiations had been set to start out that working day, plus the program demonstrates it, with 29 tests executed in Oct, four of these on the final working day. Just one ot