In some cases of high jumps into water, an explosive is set off underwater, creating gas bubbles right before the person or object hits the water. This is done because gas is easier to move through(think like walking in the open air versus walking in water, and this is a sort of in-between)
And water is so hard to move through, that if you fall onto it at high speed, you have to take up all that force you would when normally moving through, just much, MUCH faster and with a LOT more power.
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