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Once the inside is full of water, you can open the doors 😀
It's not that simple. Mythbusters tested it and with a sample size of n=1 they weren't able to open the doors as quickly as they needed. Seems the cabin has to be completely full of water and since most cars tend to sink nose first there is usually a pocket of air at the back long after the front area has filled up, you'd need to hold your breath way longer than you think.
Greenbank
nick_h.
Once the inside is full of water, you can open the doors 😀