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subterranean
01
lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed)
02
situated, occurring, or existing beneath the surface of the Earth
Example
The subterranean river flows silently beneath the ground.
The subterranean tunnels were used for secret military operations during the war.
She explores the subterranean caves to study geological formations.
Our city has a network of subterranean passages used for utilities.
Some caves are home to unique ecosystems, with specialized plants and animals adapted to the dark, subterranean environment.
