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

With test moratoriums about the horizon, American weapons labs rushed out many new patterns. A hard deadline for testing was set at midnight (0000 hrs), 31 Oct 1958, as negotiations were set to get started on that working day, and the timetable displays it, with 29 tests executed in October, four of these on the final working day. Just one other te