If your car ever gets submerged, in unbuckle your seatbelt, roll the windows down and once the water gets high enough in the car, you can open the door or climb through the window. This is pure panic from someone who should know better.

In an old car with crank windows, that’ll work. In a new car, the electrics have to still be working, and in a Tesla the OS has to still be running.

If you can’t get the windows down before the water pressure seals them shut, it’s still survivable without a glass breaker if you keep your wits about you and the car doesn’t flip. You’d need to take a deep breath right before the interior completely fills with water and then just sit there until the pressure mostly equalizes. There was at least one reported case of someone in a submerged car specifically crediting their survival to Mythbusters successfully showing just that, but a variation of the scenario involving the car flipping while sinking into deeper water later proved to be much less survivable.