that's pretty cool

Bulldog, there is another thing you can try. It's called SNUBA.
John and I did it in Cuba. They took us to Bay of Pigs, and they float the tanks on the surface on a little raft and you put some weights on, put the regulator in your mouth and sink.
It's like snorkelling with the air. No other equipment is necessary. You only go down 15 -20 feet but it's fantastic.