CONSIDERATIONS TO KNOW ABOUT UNDERWATER NUCLEAR TEST 'UMBRELLA' (1958)

With test moratoriums to the horizon, American weapons labs rushed out several new models. A hard deadline for testing was set at midnight (0000 hrs), 31 October 1958, as negotiations had been set to begin that day, as well as program shows it, with 29 tests executed in Oct, 4 of these on the final day. One particular other test was cancelled mainl