Why do people, submarines, and essentially everything that dives too far into the water get crushed? I get that it’s the weight of the water, but shouldn’t the pressure just come from the top and not everywhere, as if there were a weight on you?
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It’s not weight, it’s pressure. Think of water as really dense air. When the pressure inside the submarine is significantly less than the pressure outside, it compresses. You can replicate this at home by sucking the air out of a plastic bottle. Same principal. One thing submarines do to combat this, is slowly increase the internal air pressure so there is less of a differential. This has to be done slowly, to prevent it causing problems for the humans inside. Likewise when they come up to the surface, they need to undergo a decompression process. Just like when scuba-diving.
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