Deep Sea Designs has put together this short list of websites affiliated with the sumbarine and RC hobby.

If any of the links become broken, please let us know and we'll make sure to correct them immediately.

D&E Miniatures - Offering a full line of ready-built WTC units for sale
SubPirates - Great site. Lots of good information here.
Mikes Subworks - A full line of RC submarine electronics and kits
The Scale Shipyard - many submarine and surface craft hulls for sale here
The SubCommittee - the hobby's premier site for information dedicated to submarines RC, real, and static
The Nautilus Drydocks - Bob Martin's site dedicated to his construction of an RC Nautilus