Here is a gallery of awesome tech for the pool, the beach, and 20,000 leagues under the sea.
Larger versions of jet-type underwater vehicles have helped divers reach exhausting depths. But what if you just want to scoot around the perimeter of your beach resort? BladeFish has developed Seajet, a compact version of those jets you see in the Cousteau movies. It's about the size of an office fan and pulls you through the water at about 5 mph on a half hour charge.