It's a magic skill acquired by wearing your underwear on the outside. The name is a hint, you see: underwear, underwater. They're only one letter different!
I'd argue that "ea" is only one letter different from "ate" - though it's a little-known fact that the swapping of the two remaining letters is why Aquaman always had his knickers in a twist. And not at all because he was the most useless superhero ever.
DId you ever wonder how it is that if superman gets his powers from the sun he still seems to have them when it's night time or he's underwater?
up his arse?
I love how fans can always find an excuse, it's the same with me and my star trek :)
The good people involved with Star Trek published several tech manuals including their explanations supporting transporters, warp theory etc :)