If you have, say, two tubes of different internal pressures submerged to a given depth (for sake of the example, let's just say 1,000M underwater or 100 ATM), will the smaller internal air pressure tube experience a greater relative force from the water pressure? The water pressure on both tubes should be the same from the outside, but is there an additional effect where water tries to equalize the pressure at a greater magnitude of force on the tube with less internal air pressure? I guess an extreme, clearer hypothetical comparison would be between a tube with a vacuum on the inside compared with a tube with air pressure equal to 99.99% of the water pressure on the inside. I'm also assuming that the tube's microstructure is impermeable to water, and that the tube is strong enough to withstand the water pressure at the given depth. Thanks in advance!