This video is of the first generation boat using compressed gas into a chamber to surface. Releasing the air dives the boat. Limited gas supply. I usually get stuck dived as I lost track of my gas volume. Easy to squirt all of it in one push of button. The newer boats are RECARBS system. Self contained air system recirculated between bladder and compressed air tanks.
Exploded view of the Submarine system: fwd section is power, mid section is ballast, aft section propulsion, controls, radio.
General view of the WTC of the Harpoon class Submarine. a summary of section contents.
Elaborate phantom view of the mid section, Ballast. Two bladders fill or empty makes the boat dive or surface statically.
Video of latest design, boat no. 898 (9th boat). The sketches shown pertains to this boat.