underground base
Subterranean command center
An underground base is a military installation, research facility, or operations center built beneath the earth's surface, typically for protection against attack or to maintain secrecy.
The term appears frequently in conspiracy theories about hidden government facilities: They claimed the government was running experiments at an underground base in Nevada.
In video games and fiction, underground bases serve as villain lairs or secret headquarters.
- bunkerReinforced subterranean stronghold
- secretConcealed information
- militaryArmed forces collectively
- war roomStrategic planning headquarters
- government facilityState-operated premises
tunnel · escape tunnel · hidden · facility · top secret · vault · shelter · emergency supplies · classified · subterranean · concrete · missile · silo · covert · laboratory · compound · nuclear · nuclear fallout
- hideawayshideaway, hideout, hiding place, lair, den
- secret lairslair, hideout, hidden chamber, fortress, dungeon
- Cold War SitesBerlin Wall, Checkpoint Charlie, Iron Curtain, Brandenburg Gate, Kremlin
- military structuresfort, bunker, foxhole, trench, pillbox
- space colonieslunar colony, space station, space habitat, mining colony, orbital station
- hiding placeshideout, bolthole, cubbyhole, den, hidey-hole
underground basemobile command center
Transportable coordination facility
mobile command · field camp · field headquarters · airship · forward operating base
underground, base, under, ground, undergrounds, bases, based, baseline, basement