TOP UNDERWATER NUCLEAR TEST 'UMBRELLA' (1958) SECRETS

With test moratoriums over the horizon, American weapons labs rushed out quite a few new layouts. A hard deadline for testing was set at midnight (0000 hrs), 31 Oct 1958, as negotiations have been established to begin that day, and the plan demonstrates it, with 29 tests executed in Oct, four of them on the last working day. One other test was canc