2 man wet mini sub I built when I was 14. Started as a tow sub and then I added a battery compartment and some aircraft fuel pumps for motors and fiberglassed them onto the forward planes. The shell was from a surplus aircraft wing tip tank. My dive tanks were converted CO2 tanks from an aircraft. My dad was a pilot, engineer and master mechanic for Pan American Airlines (big surprise, huh)......guess I had it in my blood.