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Talking with a co-worker who doesn't like the ocean. He won't go near it. He won't travel by ship. He won't go to the beach. He doesn't even like flying over it. The weird thing is he has no problems with a swimming pool or river. He's a really good swimmer in fact. Even used to be a lifeguard for the pool at a nearby YMCA. So I asked him why he's afraid of the ocean. He said, "I'm not afraid of the ocean. I afraid of big things in the ocean."
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If you think that's unnerving..
Imagine extraterrestrial oceans like on Enceladus or Europa. Even though it is a moon, Europa alone has more than twice as much water on it as Earth does. It is permanently covered by ice so you would have to dig down maybe a couple dozen kilometers to even get to it, and from there it might be another 150km (90+ miles) or more before you'd reach the bottom of Europa's ocean. That's over 10x as deep as any ocean here on Earth. Of course being so far from the sun and covered by kilometers-thick ice besides those oceans will be completely dark from top to bottom. However, at the bottom are probably hydrothermal vents like there are here on Earth. It is quite possible that there is life - of some sort - lurking in those oceans as well.
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