Into the Blue (2005)

A group of divers discover what appears to be a legendary treasure of the highest value. However, at the bottom of the ocean, they encounter a much more disturbing mystery and decide to make a pact to keep their recent findings a secret. Even so, their loyalties are tested and they may become someone else's target. An entertaining action-adventure film, with wisely chosen moments of intrigue and tension that is sustained until the very end. If you've never seen it, don't miss it.