The sub is called Resurexxi, and was totally scratch built by Paul Brassington, a member of The Association of Model Submariners. Paul has been developing this boat for a number of years, and I think I can say that it is one of the best performing subs around at this time.
Paul even designed and built his own radio outfit for the boat...not a fancy radio like you see nowadays, but one with a steerwheel and on/off switches.
Rich