Onder andere met: Cole Hauser (Jack McAllister, cave explorer), Lena Headey (Dr. Kathryn Jannings), Eddie Cibrian (Tyler McAllister, cave explorer), Piper Parebo (Charlie, rock-climbing professional), Morris Chesnut (Top, Buchanan, Daniel Dae Kim survival expert)(Alex Kim, camera man), Marcel Iures (Dr. Nicolai), Rick Ravanello (Briggs, diver), Kieran Darcey-Smith (Strode, sonar expert), Vlad Radescu (Dr. Bacovia)