Me too. I always figure that in the event I go in the water I at least want to improve my chances of being conscious so that then I can then deal with panicking or not. I also have a seat-belt knife in my center console and a steel center-punch in a sheath clipped to the side of my seat.
Good idea. I keep meaning to get one of those combination cutter/hammer devices for my evil SUV.
“steel center-punch”
For breaking a window? If not it sure sounds like a good idea. The thing I think about most with a submerged car is how to break a window because opening a door would probably be next to impossible.