Rule 3. Don’t open the door! Roll down the windows instead. Opening the door is very difficult against the water pressure and it also allows so much water into the vehicle that it will speed up the sinking process.

You’ll have 30 seconds to a minute until the water rises to the bottom of the passenger windows. This is what Geisbrecht calls the floating period. After that, the water pressure will force the window against the doorframe, making it essentially impossible to roll down.

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• How to Escape a Submerged Car - Authored by: squib on Thursday, May 30 2013 @ 05:31 PM EDT
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