From the same Elite and their Support book, the following description:
“Piranha Special Purpose Submarine
Manufacturer: Vickers Shipbuilding and Engineering Ltd., Barrow Shipbuilding Works, PO Box 6, Barrow-in-Furness, Cumbria LA14 1AB, England
This small submarine, with its hull form and other features designed to generate little noise, can position special forces with their weapons and equipment close to a target beach. Swimmers leave and re-enter the submarine while it is submerged. The Piranha's small size and manoeuvrability also enable her to enter harbours and lay bottom mines. Her third role is surveillance, when her smallness and quietness contribute to undetected periscope observation of enemy activity. The general arrangement of the boat provides a control room, aft of which is the cargo personnel accommodation with bunks, above one 60-section lead-acid battery cells, and in the stern is the engine with its motor/generator. Forward of the control room is the diver's lock-out chamber and crew accommodation above the second 60-section batteries. The external hull extends forward and aft of the pressure hull and contains the main ballast tanks and bow sonar array. Inflatable craft and swimmers' aids are carried in the superstructure casing. The endurance of the Piranha is over 1,500 km on operations with a maintained 7 km/hr submerged for eighteen hours. On passage or continuous patrolling while snorting, the boat has a range of 3,300 km and carries sufficient stores for a patrol of twelve days.”