Well, people can float. Also people can swim, so even if they were super muscular and lean and this made them incapable of floating (I don’t know if that happen

Well, people can float. Also people can swim, so even if they were super muscular and lean and this made them incapable of floating (I don’t know if that happens), they could swim if they knew how. It sounds like hippos in deep water are incapable of swimming to the top. Based on what I am reading in this thread, they would simply sink. Humans, properly instructed, can avoid this by swimming.