THEY CALL HIM FLIPPER, FLIPPER, FASTER THAN LIGHTNING ....

(hat tip zgeek)
Now, you can swim with the Dolphin with this underwater bionic dolphin. Like a submarine, it can swim only 2 mph slower than the real mcCoy. A cross between Flipper and a fighter jet, the fully submersible watercraft is "designed to mimic the look and abilities" of its marine counterparts. The machine is capable of performing the same tricks as living dolphins, including dives, barrel rolls, jumping in and out of water and "porpoising".

Official site

Watch it in action here. (.mpg 110MB)

Me wants one!