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My paintball gun's air tank is 4500 psi and I dive into the dirt/rocks/walls with it. They build these things strong, especially the larger tanks that I fill from. There would also be a weak-point like in the large tanks that i fill from. If something goes wrong, the weak point breaks and air dumps out... quite violantly, but it beats an explosion.
An advantage of compressed air over electrical is that you COULD set up refueling stations that you can pull into, get a fillup and leave. Unlike an electric car that requires an overnight charge. This means that your "range" is not absolute. You drive your 200 miles, then stop and refill and get going again.
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