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

With test moratoriums to the horizon, American weapons labs rushed out quite a few new patterns. A tough deadline for testing was established at midnight (0000 hrs), 31 Oct 1958, as negotiations were established to get started on that working day, and also the timetable exhibits it, with 29 tests executed in October, four of these on the final work