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

With test moratoriums about the horizon, American weapons labs rushed out several new patterns. A hard deadline for testing was established at midnight (0000 hrs), 31 October 1958, as negotiations were being set to get started on that working day, along with the schedule reveals it, with 29 tests executed in Oct, four of them on the last day. Just