NEW STEP BY STEP MAP FOR UNDERWATER NUCLEAR TEST 'UMBRELLA' (1958)

With test moratoriums about the horizon, American weapons labs rushed out numerous new models. A tough deadline for testing was set at midnight (0000 hrs), 31 October 1958, as negotiations have been established to get started on that working day, and also the plan demonstrates it, with 29 tests executed in Oct, 4 of these on the final day. One part