Prototype Minelaying Submarine
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Beneath the casing ran two rails which stretched the entire length of the casing, except in Porpoise. The mines were stowed on the rails until the time of laying the minefield. The casing had large stern doors which were opened when laying the mines and the mines were strewn through these stern doors.
Original intentions were to build more of this class but with the introduction of a special mine which could be accommodated and laid through the torpedo tubes these never materialised.
Though the new type of mine was developed with the intention of patrol submarines being able to lay minefields this was never the case during WWII and all mine laying was carried out by this class during the duration of WWII.
2 Admiralty x 1,630 bhp electric motors.
8.75 kts sm
1 x 4 inch gun.
2 x Machine guns.
64 nm at 4 kts