WHAT DOES UNDERWATER NUCLEAR TEST 'UMBRELLA' MEAN?

With test moratoriums over the horizon, American weapons labs rushed out quite a few new styles. A hard deadline for testing was set at midnight (0000 hrs), 31 October 1958, as negotiations have been set to begin that day, along with the program displays it, with 29 tests executed in October, four of them on the final working day. A person other te