Continuity: When Tyler is resuscitating Katherine he cuts and then rips her swim suit down to her belly button, but in the next shot when she is climbing up the cliff the cut is only up to her breast bone and has a zip on it.

Continuity: When Briggs is talking to the rest of the team on the fiber optic line, the counter on the video screen jumps backwards between shots.

Factual error: The dive crew says they are using rebreathers as dive gear. Rebreathers do not produce bubbles, but most of the underwater shots show the team making bubbles.

Plot hole: During the climax, when Top turns on the air flow from his tank, he holds the pressure gauge in his hand so that the face of the gauge is pointing toward him. In fact, you are supposed to point the face of the gauge away from your body, so as not to cause injury if it the glass explodes. No experienced diver would make that mistake.

Plot hole: Tyler jumps into the water, then grabs his mask and puts it on and begins swimming, but he fails to clear his mask by blowing the water out of it. Without clearing it, he wouldn't have been able to see a thing.