[allblues]

Sub hulls are the only thing resisting the pressure. Interior pressurization has no effect whatsoever, as normal atmospheric pressure is 14.7 psi and obviously would have no effect on resisting the 5000+ psi pressure at that depth.

[daniel1212]

Sub hulls are the only thing resisting the pressure. Interior pressurization has no effect whatsoever, as normal atmospheric pressure is 14.7 psi and obviously would have no effect on resisting the 5000+ psi pressure at that depth.

Thanks for the correction. I had read that subs increased air pressure to compensate for lower oxygen levels, and that airliners needed to be pressurized at high altitudes in order to maintain structural integrity (besides breathing), and since everything on the Internet is true:), then I thought subs needed the same.