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| The vault door had been welded shut when the building was sealed. After the base was closed, a team was sent to access the building to see what was inside. They had to cut through the 6 inches of steel in order to do that. Inside, (after releasing a large amount of what was thought to be radiation, later "officially" identified as radon gas) they found more vault doors. |
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There were 4 doors, 2 on each side of the corridor, one of which was open. The others had been cut through.
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