They live in a subterranean tunnel and emerge at night to feed.

The beetle uses them to create and maintain the subterranean tunnels in which they spend most of their lives.

They live in subterranean tunnels, coming out one month a year to lay their eggs, but only at night.

There was a subterranean tunnel, which has now been filed in, which gave the camp safe access to a nearby spring for water.

It links to the larger caves through subterranean tunnels.

Will taking the highway one day involve closing your eyes and letting automated systems drive you through a system of subterranean tunnels?

One of them is about 26 feet high, with huge subterranean tunnels beneath it.

Yasala doubtless knew every turn and twist of the subterranean tunnels.

Medoxa had carried her nearly to the exit of the massive subterranean tunnel.

The castle was equipped with subterranean tunnels which served as exits several km away from the city in difficult times.