R/C Submarines - radio controlled subs

Here's a great website on radio controlled (R/C) submarines.
http://www.rc-submarines.com/r_c_subs.htm 

There's a lot of information here and plenty of links to other sites, but I have to include this r/c sub made from plumbing pipe.  It's crude in a well-designed sort of way.  Go to this website http://web.ticino.com/Submarine/ and click on E1 to see what I'm talking about.