Three teenagers were killed when their car skidded off the road in southern France, went through a wall and crashed upside down in a private pool, trapping them inside.
The vehicle was a similar size to the pool and the teenagers - aged 14, 15 and 19 - were unable to open the doors and drowned.
If you find yourself in a car sinking in water, conserve your energy because the doors will not open until your cabin is submerged. Take a deep breath at the last second that you can (you will need it) and wait until you are fully underwater to try to open the doors. This may not have been possible with the shallowness of the pool in the above news story. There are also specialized tools for breaking car windows that you can keep in your glove compartment for emergencies.
the car was the size of the swimming pool, and upside down, so they had no chance to exit it
None of this helps you if there are concrete pool walls keeping the doors from opening
Sorry if the link is not allowed, but after reading about a family drowning after skidding off a slippery road into a large pond and drowning because they couldn’t get the doors open, I bought two of these. A spring loaded hardened steel tip, you just press against the glass and it shatters your door window so you can escape. Also has a seatbelt cutter.
https://resqme.com/product/resqme/