Big Dave, Did you want to see the inside because you are hungry?
From the left: screen to allow water in, green tubing for reverse from small black pump, servo operated diving planes(tomato slices), standard RCABS cylinder with bladder lifted off to show yellow 2 function Jomar switch for forward and reverse, blue rudder servo, larger water pump for forward propulsion. There are 5 C size NiMH cells on each side of the WTC, in series, for 12V power. They are in bladders for waterproofing. I don't expect long life from the two "waterproofed" servos in the wet area, but they can be replaced inexpensively.