I personally like it. I like the underwater-y-ness and how dark and quiet it is. It's interesting to swim through there, too, like some sort of sea monster or something is around (Or maybe YOU are the sea monster. //monotonous gasp//) or just in general enjoy the peacefulness under there.
If you're an introvert like me, too, it's nice to retreat there for a while. ...I might be sort of repeating myself, but whatever. |D Again, it's nice. I like it. A hidden little map like that too is kind of cool.