THE ULTIMATE GUIDE TO UNDERWATER NUCLEAR TEST 'UMBRELLA'

With test moratoriums over the horizon, American weapons labs rushed out many new layouts. A hard deadline for testing was established at midnight (0000 hrs), 31 Oct 1958, as negotiations were set to get started on that day, and also the plan reveals it, with 29 tests executed in October, four of them on the final day. Just one other test was cance