Definition of «subterranean»

Subterranean means underground or situated, occurring or located beneath the surface of the earth.

The spelunkers explored the subterranean caves, navigating through narrow passages and marveling at the intricate rock formations.
The miners descended into the subterranean tunnels, equipped with helmets and headlamps to extract valuable minerals from deep underground.
The scientists discovered a new species of subterranean worms during their study of soil biodiversity in the rainforest.
The ancient civilization built subterranean catacombs to bury their deceased, creating winding networks of underground chambers.
The construction crew had to reinforce the foundation of the building due to the presence of subterranean streams that flowed beneath the site.

The Yucatan Peninsula is home to vast network of subterranean rivers and flooded caverns. (cancuntours.net)
The next goal is to return to the Puerto Princesa Subterranean River in Palawan and (hopefully) go diving in Tubbataha Reef! (traveling-up.com)
Then foragers search their territory for seeds, which are stored — as many as 300,000 of them — in subterranean chambers. (discovermagazine.com)
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