00:00Hidden underneath this palatial West Virginia hotel
00:03is the site of one of America's most closely guarded Cold War
00:07secrets.
00:09In the event of a nuclear attack,
00:11this vast subterranean bunker was designed
00:15to provide more than 1,000 people with enough water and food
00:19to survive for 60 days.
00:21I walked by it thousands of times
00:23and never thought, oh, there's an 18-ton blast
00:25door behind there.
00:27How was the construction of this massive structure kept
00:30confidential from the people living and working in the hotel
00:33above?
00:34One of the techniques they used to keep it secret was hiding
00:37it in plain sight.
00:38And how was its cover suddenly and shockingly blown?
00:42The bunker was really sort of prepared for everything except
00:45this.