Might I humbly suggest that you consider joining The SubCommittee? Our quarterly magazine, The Report, is full of all kinds on info on building R/C subs, details of the real thing, how-to info, etc. Also, the camaraderie of joining up with fellow sub modelers can't be beat. Nothing quite like getting together with a dozen other guys running subs and sharing ideas.
Membership Chairman, The SubCommittee
Underwater, the ONLY way to fly!
SubCommittee member #0069 (since the dawn of time)