[evgeny]

Russian company developed pedal boat, capable of diving to a depth of 30 meters.

Pedal boat - an alternative to traditional riding at the weekend on the water bike.
Pedal boat - used a phenomenon called the Coanda effect - which enables a pair of people to create sufficient traction for movement.

is expected to cost 50 000 pounds, although prices may fall to about 15 000 pounds for wholesale buyers.

http://www.telegraph.co.uk/technology/n ... arket.html

[Golgo13]

Expensive toy.

I'm sure if you wanted one that you could design & build something similar for much cheaper.

[evgeny]

Expensive toy.

I'm sure if you wanted one that you could design & build something similar for much cheaper.

If you think is a easy, just try to do it by your self.
probably you don't understand physics at all

[PrestonSturges]

Similar things have been around for 50 years. Heck 'The Turtle" was human powered 200+ years ago.