How is air in a scuba tank which is fixed and rigid get affected by the pressure of the water outside of the tank? Shouldn’t the volume of the air in the tank remain constant once as the tank does not get deformed (squished)?
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The volume of the tank isn’t the issue. The tank itself is rigid and at way higher pressure than the surrounding water at depth, otherwise the air wouldn’t come out.
Instead the issue is that the air is trying to fill the diver’s lungs and the diver themselves are somewhat squishy. In order for them to be able to inhale against ambient water pressure the air supplied must be of a matching pressure, which means a higher relative surface volume in each breath at depth.
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