DETAILED NOTES ON UNDERWATER NUCLEAR TEST 'UMBRELLA'

With test moratoriums over the horizon, American weapons labs rushed out quite a few new layouts. A tough deadline for testing was established at midnight (0000 hrs), 31 Oct 1958, as negotiations ended up set to get started on that day, plus the agenda exhibits it, with 29 tests executed in Oct, 4 of them on the last day. One other test was cancell