This movie is less realistic than Slotherhouse. No one on the crew had their Open Water certification. Absolute crap. 3 because they killed that one really annoying guy who sucked and I imagine he's the wretched people who wrote/directed this crap. But it's only 1.5 hours so...I kinda like it. Would have been 20 minutes had they just opened the door so...I really hate it.