We discovered a hidden tunnel that runs directly beneath the city ... From old infrastructure to mysterious offshoots, this secret underground path feels like a world of its own. ActionAdventureTwins.

Building on the success of a previous short video, the proposed film will explore urban legends about the tunnels under ...

Forty feet underground, the city's once-bustling system of freight tunnels remains. Social media videos show adventurers and thrill-seekers looking for the tunnels — but are they real?

The tunnels lie directly below London Underground’s Central Line in the city’s Holborn area. Work to dig them began in secret in 1940, when Britain feared invasion by Nazi Germany.

The tunnels lie directly below London Underground's Central Line in the city's Holborn area. Work to dig them began in secret in 1940, when Britain feared invasion by Nazi Germany.