We don't really understand how this works because one of the big challenges of studying these animals is like we couldn't survive down there, they actually can't survive up here when there isn't as much pressure. So, some of them have this molecule called a (PISA) light which actually prevents other molecules from being distorted when they're under pressure. They have lots of different changes to their physiology. So, that kind of stops them from being squeezed too much. So, their muscles for example have lots of water in them and water isn't compressible. And one of the things they do is that they don't have air pockets inside them like we do. But they've evolved to live in that pressure. So, it could be that deep sea creatures have over a thousand times the pressure on them that we do. So, that's one of the amount of pressure we have on us for every 10 meters, you go down in the sea. In fact, the pressure increases about 1 atmosphere. When you go down into the deep sea, there's a huge amount more pressure. There's air inside us and there's air around us and that kind of balances out. The only reason it doesn't crush it most of the time is because that there's air inside it as well. And actually, you can see how great that pressure is if you've ever seen someone suck the air out of the inside of a can and it immediately crumples because the air pressure is strong enough to actually crush that can. We have pressure pressing down us all the time from the air above us. Ginny - Well, the first thing to say is that we ourselves are designed to withstand pressure.
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