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Video shows a rare glimpse inside a till now TOP SECRET US Nuclear Missile Silo & Launch Facility of the 91st Missile Wing at Minot Air Force Base in North Dakota.
Rest of the video features ICBM (Intercontinental Ballistic Missile) test launches.
A missile launch facility, also known as an underground missile silo, launch facility (LF), or nuclear silo, is a vertical cylindrical structure constructed underground, for the storage and launching of intercontinental ballistic missiles (ICBMs).
The structures typically have the missile some distance below ground, protected by a large "blast door" on top. They are usually connected, physically and/or electronically, to a missile launch control center.