Underground base

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An underground base is a subterranean facility used for military or scientific purposes.

Examples are:

There are more than 10,000 underground military facilities worldwide.[1]

See also[edit]

References[edit]

  1. ^ Richelson, Jeffrey T. "U.S. Intelligence: Hiding of Military Assets by "Rogue Nations" and Other States a Major Security Challenge for 21st Century". gwu.edu. George Washington University. Retrieved 16 July 2020.