I found this sub a minute ago and immediately thought of an anecdote to tell you guys

I was 17, with my friends on summer vacation at a small bay that was 3 km (~2 miles) long between the two shores. So we're chilling one afternoon on a beach and a friend asks me for how much money would I swim over to the other side. Enough to not have to move an inch in my life ever again if I didn't want to, I replied. So in the spirit of adventure, we started swimming and made it to the other side in a few hours, then walked barefoot all the way back around (a c shaped bay and we swimmed straight across).Three days later, we were having some beers in the evening, and a friend of mine says we should totally do it again right now. So what the hell, three of us were off. As we're swimming, I realize a few things.The first time around, it was broad daylight, there were ships and people, and the waves were not that big, but enough to totally steer us off course as we tried to swim a straight line. So the sea is completely calm almost like an empty swimming pool, it's a moonlit night, with lightning on the horizon and it's 11 pm. I've never felt calmer in my life I think.The second thing I realized disturbed that calm. As I open my eyes underwater while swimming I can see.. nothing. And it's much much worse than in daylight. First off, you don't know how deep it is, you see maybe a few inches in front of your face, and that's it. I cannot describe how disturbingly dark it was, imagine looking through oil, but you don't know what kind of shit there is down there.And the third thing. It was so calm, and then it hits me. We're are literally the only thing moving on the surface in a huge radius, in the middle of the bay, with far away lights on both shores. As I mention this to my friends, there is a silence broken only by a "go fuck yourself dude". If there ever was a time for a shark or some H.P. Lovecraft thing to get us, this was it.We made it across much faster because not so many waves. A few days later, the city organized a swimming marathon along the same route, but with escort lifeboats. We swam that too.