Subterranean (adjective)

Located, happening, or operating below the surface of the earth.

Origin:

The term 'subterranean' is derived from the latin 'subterraneus' which means 'underground'. it is formed by the combination of the prefix 'sub-' meaning 'below' and the word 'terra', meaning 'earth'.

Examples:

1. The city has a vast network of subterranean tunnels.
2. Subterranean rivers flow beneath the earth's surface.
3. The subterranean garden was a peaceful oasis in the heart of the city.
4. Subterranean organisms have adapted to life in the dark, damp conditions.
5. The city is home to a number of subterranean nightclubs and bars.