Thanks, good demo on the Mythbusters youtube video. Another good video links from there — Escape a Car Underwater
What I liked about that video is they discuss and then demo the physics of opening a door underwater and during one exercise they fail and go to the air regulator. They also demo a window punch to shatter the driver side window, thus immediately equalizing pressure and the door opens.
Better is the Enemy of Good Enough.
Okay, what’s your point??