Some inventions!

I was watching a tv show called "Modern Marvels" it is about things people have invented. They have some people inventing this thing sort of like a dolphine fin. It is to help people swim faster. They are also hoping to for people to be able to eventually leap out of water just like dolphins and whales. I am not too sure what a normal person would do with this inventions but I see divers being able to use it. I know how important time is to a diver. So being able to get down to the desired location and back to the boat with greater speed would be very useful. I just thought this was kind of interesting.