The ''Parthian''-class submarine or P class was a class of six

submarine A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited underwater capability.) The term "submarine" is also sometimes used historically or infor ...

s built for the

Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...

in the late 1920s. They were designed as long-range patrol submarines for the Far East. These boats were almost identical to the , the only difference being a different bow shape.

Boats

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