Pretty much.
In an HMMWV/Humvee, if you have the deep water fording kit you do the same thing but you sit up on the seat back and steer with your feet. If you do that, you can ford 7' of water.
Roll your windows down, just in case. That way you can swim out if it ends up being too deep.
I can understand not being able to open the doors under water, but why can't you open a window under water?
You want them already down to save the time and panic. People panic, even trained Marines, under those circumstances, so the window is already down. If water is up to your nose, you don't want to try to force yourself down, unwind a window, and then swim out. You just want to swim out.
It also lets the pressure equalize much quicker. Water is one hell of a force. You don't want to be swimming against the water rushing in. You want it to seek an equilibrium rapidly so that you're not fighting against it.
Also, you did it because that's how you were told to do it.
I am not one who panics. If the windows were up and I roll them down I would get a breath and wait for the water to stop rushing in, which I know it will do when its full.
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