I went to see it yesterday.
Though everything was almost expected to happen, I couldn't resist to blame James Cameron to sacrifice credibility towards making the movie more dramatic.
It's supposed that this type of movie is going to be seen by a large number of divers, so, me, as a diver, with little to no knowledge about rebreathers and cave diving could see a lot of mistakes and things to complain, here is my list :
1) The first she diver that dies when the rebrether hose exploded, had a wetsuit with a very legible SSI logo. Bad for SSI, as she dies because she hadn't an emergency breathing backup. No cave diver dives without an emergency breathing backup, never. **** happens, always.
2) The rebreather hose was losing air because it was broken when they went through the small hole to arrive to the cathedral. Suddenly the hose exploded. Those hoses are low pressure hoses and should not explode the way they showed. Please correct me if I'm wrong.
3) Almost at the end of the movie, the son took a chemical light, broke it to light and went out with the ponny bottle breathing directly from the valve. Nice, however, the chemical light suddenly turns off. Chemical lights will light for at least 12 hours losing intensity with the time, but they never go off suddenly.
4) As they has no battery left in the helmet lights, when they arrived to the 2nd WW tank place, they took out some oil from the oil tank and made torches. It's supposed that that tank was there since 2nd WW, so the oil should have something like 70 years old and was still usable ?
5) There is no time frame during the events, so I cannot tell you how many days have passed until the last guy goes out to the surface and the beach was calm, sunny, and the waters crystal clear. It's supposed that there was a huge tornado with heavy rain and wind. The sea water in the beach should have been brown, the beach damaged and perhaps cloudy.
Just my thoughts.