They live in underwater tunnels as well as open water.

Most of the subway system's underwater tunnels were excavated in rock.

An underwater tunnels and a sunken ship are also part of the exhibit hall.

The underwater tunnel, which is now underground after the water had gone, still exist and can be accessed.

This place could only be reached via the underwater tunnel.

These one-storeyed building can only be entered via the underwater tunnel.

The island is connected with the mainland through an underwater tunnel and several bridges.

Beacon held like a sword of light, he swam into the underwater tunnel.

Construction of the campus will take 3 years and will include an underwater tunnel.

When the serpent fled, part of its body made it into the underwater tunnel.