And in the cold of the winter nights it was also much warmer in the subterranean world.

She continues to present this weekly discussion show, and here looks at the subterranean world of tunnels, catacombs, geological fissures and diamond mines deep underground.

Descending a single flight opens up an extraordinary subterranean world.

And as well as access to the museum, tickets give entry to a subterranean world that has remained hidden from public view.

While depicting the expressions of anonymous crowds in the urban subterranean world, the narrator continuously mulls over movie scenes and bars of pop music.