Gabriel

It looks like the air meter will actually go down at a reasonable rate this time around. In Endless Ocean, it was simply not feasable that someone would run out of air. It probably lasted more than an hour. In this video we see the diver with even a half tank of air. If you pay attention, it looks like the air suddenly drops one box if you get attacked by a dangerous animal. Like in real life, scuba diving whiled distressed causes you to breath more and use more oxygen, limiting your time underwater.