Interesting stat. It took 12 minutes for an Egyptian diver to dive to the world record 1,090 feet. Took him 15 hours to make it back to the surface because he couldn't risk dying from decompression sickness by ascending any faster. Bubbles basically form in bones and you essentially are crushed from the inside out. He trained for 4 years before attempting this.
Point being once you reach a certain depth, the pressure is ridiculous. The issue isn't Storm but all the mutants down there with her.