The test was called "Castle Bravo" and the device was code-named "Shrimp."
Got down into one of these southeast of Roswell back in about 1970. There were 12 surrounding Walker AFB in Roswell until the state went Republican in the 64 election and LBJ shut down the base.
There were system books still in the living quarters and I took one showing complete illustration of the huge spring suspension system supporting the missle and frame used to raise the missle to the surface.
They were salvaging one north east of Roswell when a fellow backed a D8 Cat into the silo with the doors open. His last ride on his Cat, 300’ down. It happened to be the silo where static electricity set one of the missles off inside the silo. Apparently there was a problem early on with static electricity and I got to look down into the silo where all the I beam structure was bent all to hell and burnt black.
The sheriff told me it was very creepy because there was no visible activity at the silos and about once a month in the middle of the night this highly polished and reflective missle would quietly rise out of the ground and a few minutes later it would quietly disappear back into the ground. At first he said they wondered if the cold war was getting ready to turn very hot but finally realized they were just checking out the systems. His little home town was using the silo’s water well to its water supply.
