This could've been a pretty good movie but the story was kind of stupid. It's along the same vein of the eco- horror movies that came out a lot in the 80s where man has disrupted the ecosystem and a creature has been unleashed to get revenge on them. So with this movie, the oil rig has opened up a cavern and leaked oil everywhere in the ocean and the ocean God is mad and unleashes a Megalodon Shark to get revenge on the guy who Signing off on the safety inspection even though it had tons of problems. The shark also seems to have some kind of telepathy to make people see hallucinations. And from what I got from the movie it also causes them to become overdramatic and turn on each other. I hope that's the case because a couple of scenes in the movie the characters just seemed to fly off the handle and act psychotic. Sounds kind of ridiculous doesn't it? On a positive note though it was filmed pretty well and the shark didn't look bad. I think you could take the idea of a bunch of guys stuck out on an oil rig being attacked and pursued by a Megalodon and drop the whole mysticism and it would've been a much better movie. There also would've been a lot more people to pick off with that type of movie.I don't really regret watching it but I doubt I would watch it again.