In scuba, why does the diver’s air get more compressed with depth? Does the tank not protect the air from outside forces?
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The tanks do not get compressed when you dive
If you look at [Diving_cylinder](https://en.wikipedia.org/wiki/Diving_cylinder#Working_pressure) a bar approximately an atmosphere and the pressure increase by 1 bar per 10 meters of depth. So the low-pressure take will have higher pressure on the inside down to 1650meters depth. The tanks will not be compressed to any significant degree for the depth you dive at
* low pressure (2400 to 2640 psi — 165 to 182 bar)
* standard (3000 psi — 207 bar)
* high pressure (3300 to 3500 psi — 227 to 241 bar).
You breathe in the air at higher pressure at lower depth because you like to have the pressure in the lungs the same as the pressure of the water so there is not net compression on your lungs and ribcage.
It would be had/impossible to breathe anything in if the pressure is a lot slower than the water pressure because you need to push against the water to expand the lungs and get air in.
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