You would have very little time to get out of your car. Take your seatbelt off. Open the window. If the window is locked use the window braking device to break the window and get out of the vehicle.
Due to buoyancy of the water, the vehicle weighs 1,500 lbs less for each foot of water raise. Within less than a minute, the vehicle would be completely sunk. Therefore, it is very important that you and all the passengers of the vehicle get out of the vehicle as soon as possible.
You can buy an emergency window breaker that you can use in your vehicle to charge your phone as well. Click here to see this one from Ztylus on Amazon.
This particular device can also cut your seat belt if you are in a vehicle accident and you want to cut the seat belt to try to get out of the vehicle.
Here are the mocking steps in the video that is helpful, if ever, you and your family are in a vehicle that is sinking in water:

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Tags: Safety Car Charger, Seat Belt Cutter, Vehicle Safety, Vehicle Sinking Safety