Cole Hauser, Eddie Cibrian, Morris Chestnut, Lena Headey, Piper Perabo,
Daniel Dae Kim, Rick Ravanello
(Cole Hauser) and his brother Tyler (Eddie Cibrian) are thrill-seeking
professional cave explorers who run a team of the top divers in the
world. They arrive in Romania with all the latest equipment, including
a new type of scuba tank allowing a diver to remain submerged for up to
24 hours. The crack unit, which also includes Charlie (Piper Perabo)
and Buchanan (Morris Chestnut), immediately begin their exploration.
But what they find deep inside the caves is not just a new eco-system,
but an entirely new species altogether...