DETAILED NOTES ON UNDERWATER NUCLEAR TEST 'UMBRELLA' (1958)

With test moratoriums over the horizon, American weapons labs rushed out several new models. A tough deadline for testing was established at midnight (0000 hrs), 31 Oct 1958, as negotiations were being established to begin that day, along with the plan demonstrates it, with 29 tests executed in October, 4 of them on the last day. One other test was