Underground Britain - Episode Guide

In Scotland, Rob Bell discovers the gruesome secrets of an ancient cave.

In London, Rob discovers a labyrinth of tunnels the general public is not meant to know about.

Rob explores a mile of caves and one of Britain's deepest potholes.

Rob Bell visits Europe's largest cave system underneath Brecon Beacon national park.

Rob discovers a long-lost secret when he visits the ruins of Nottingham castle.

Rob explores a mystical cave system that altered Victorian Britain's view of human history.