If you’re deep underwater, all of the water outside and on top of ypur car is weighing down against the door, effectively crushing it inwards. You’re trying to open the door with a LOT of extra weight behind it. So why does cracking the glass and/or letting the water rush into the car help you open the door? Well, when the car is filled with water, then an (almost) equal amount of water is pushing outwards from the car as there is pushing inwards, so they (almost) cancel out!
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