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Deep Underground Military Bases - Secret Military Bases
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![5 Most Secretive Military Bases in the World [Infographic] - Runaway Suitcase](https://www.reservations.com/blog/wp-content/uploads/2019/12/military-bases-bryan-goff-JuLejnakAm0-unsplash.jpg "5 Most Secretive Military Bases in the World [Infographic] - Runaway Suitcase")