A kind of strange Underwater Air Bubble question

Dec 17, 2021

Something I’ve wondered about is those amazing air bubbles that are sometimes found in underwater caves. In particular, I was wondering how the depth of the water does or does not affects them.

In my Figure 1 example, the water is 50 feet deep and air bubble in the cave has 3 feet of air from the top of the cave to the water, and the air pressure in the bubble is the same as sea level.

Well, what would happen if the same cave was 1000 feet deep? (see Figure 2.) Would the bubble still have 3 feet of air from the top of cave to the water? Or would the tremendous weight of the water make the bubble much smaller like just 3 inches tall or something? And what about the air pressure? Would the air be super compressed?

If this is the wrong place to ask this question, I apologize in advance, and if you could direct me where I could get an answer for this, I would appreciate it.

Thank you,

- SJ