The Chateau de la Treyne sits on top of a bluff overlooking the Dordogne River in France.
This castle turned luxury hotel is quite the sight to see . . . but it’s what’s under the palace . . . that these divers are interested in exploring.
It’s the Emergence de Meyraguet . . . a cave . . . with massive rooms of its own.
The three say the dive is dangerous . . . but an adventure.