Putting a door in a water tank, and reaching in with just his hand and forearm in the water, Adam was not able to strike the window hard enough to break it with a cell phone or with keys. Even after climbing in the tank, he was not able to kick it hard enough to break it even with a steel-toed shoe.
Without having seen the episode, I wouldn't expect either of those to be good tools for breaking glass, regardless of whether you are underwater. Did they do any above-water control tests?
If you go in the water, you better have a specialized tool for breaking that window. If the water inside gets high enough while you unbelt yourself and possibly others in the car, you may not be able to break it with an improvised tool.
It sounds to me as though it would be better to break the window first, and unbelt yourself and others afterwards.
How is the tip of a center punch much different than the tip of a knife?
If I had a Ritter Grip with me, I'd try using it closed. There's a steel angle at end of the thumb-ridges which looks like it would be enough of a point, while still being strong and hard enough, and with much less risk of cutting something.
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