Not really a secret - the tunnel was dug to a well which supplied the Verne citadel. At the top of the cliff is the pump house which was reinforced and looks like a bunker, nearby is Cheyne house which is where the pump operator lived. Apparently there used to be a door at the foot of the cliff closing off the entrance, but nature decided she could do a better job with a rockfall!

Great video, love the content mate, keep up the good work. 👍🏻 Black collar project 👻

You do know there was a bird ban in when you were there right? Definetly shouldn't have been near that cave 🤔

Gracious me. It looks like you dashing young lads really had quite the adventure! Good show.

Go on the bois 🔥🔥🔥