As a dive instructor for over 30 yrs with over 10k dives, this is the stupidest movie of diving I’ve ever seen. Probably written and directed by someone that has 0% knowledge about diving and diving physiology. This movie is good for teaching divers of what not to do. Plenty of examples in it .The sister going up on one breath of air holding her breath she wouldn’t have even made have way cause her lungs would’ve exploded. People that don’t dive will find it to be a good movie. Divers will be laughing there butt off throughout the whole movie Totally a waste of my time. I give it a halve star rating.