Hidden, underground, private, covert, secret, buried...
Subterranean
Subterranean means underground or hidden. The subterranean cave was filled with water.
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Subterranean does.
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Subterranean Records was created in 1979.
Subterranean Masquerade was created in 1997.
Subterranean Animism happened in 2008.
Subterranean - EP - was created in 1994.
A subterranean chamber is a room or open space that is underground.
Subterranean Jungle was created in 1982-12.