Rather than mask-associated barotrauma, it is far more likely that Lisa and Kate would have blasted out their ear drums after rocketing down to more than five atmospheres of pressure, flooding their ear canals, hitting them with a bout of vertigo and persistent deafness. But, all they have to show for their extremely fast descent is a single barotrauma-induced leaky blood vessel in precisely the wrong location.
Being stuck in a rusty cage, surrounded by inexplicably murderous wildlife provides a major wrench in that plan. At one point, Kate is engaging in multiple feats of strength in an attempt to free her sister from the cage, which is a level of exertion that cannot be kind to her overall air reserves. Not long before this, Kate advises her terrified and hyperventilating novice diver sister to breathe slowly and regularly to conserve air — not that any benefit from this is realized when the two of them are executing a continual Cross Fit workout at depth.
At depth, all that compressed nitrogen gas dissolves and accumulates in the blood and tissues. All of that is all well and good, but when the dive is over and you head to the surface, the pressure drops, and all those dissolved nitrogen bubbles are free to expand in a process not all that different from the carbonation fizzing in a freshly-opened soda bottle.
DCI/the bends is bad. It is worth avoiding at every turn. At best, it is painful and debilitating, and at its worst, it can kill you. What it isn’t, though, is anShortly after Kate escapes the cage, she swims towards the surface a bit so she can get in range of the boat, allowing her to use her mask communications system to notify Captain Taylor that they are still alive down there. Kate tells Taylor that she has 55 bar left .
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