Underwater diving is a fun sport.
I love it so much!  Even though humans aren't anatomically adapted for it, I love strapping on the scuba gear and hitting the water.  What do you like about it?
I like seeing fish in their natural habitat.
I hear you.  I love to take photos of fish while scuba diving.  It's a lot easier now that we have the right gear.  People used to just strap stones to themselves for a fast descent.