Built at a cost of $6 billion, the site was a massive complex of missile silos, a giant pyramid-shaped radar system, and dozens of launching silos for surface-to-air missiles tipped with thermonuclear warheads.
The Pyramid of North Dakota
The remnants of an early American attempt at missile defense
Thermonuclear weapon - Wikipedia
https://en.wikipedia.org/wiki/Thermonuclear_weapon
The device is colloquially referred to as a hydrogen bomb or, an H-bomb, because it employs the fusion of isotopes of hydrogen. The first full-scale thermonuclear test was carried out by the United States in 1952; the concept has since been employed by most of the world's nuclear powers in the design of their weapons.
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