00:00From the surface, a stairwell descends down to huge doors built to withstand the forces
00:07of a nuclear blast.
00:09These were Atlas F blast doors.
00:12Each one is 4,000 pounds of manganese steel designed to withstand 5,000 degrees roughly
00:19of temperature.
00:20It's pretty smooth.
00:21Exactly.
00:22Yeah, there you go.
00:23Not bad after almost 60 years.
00:24Man, you've got to have some muscles to do this.
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