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

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

s built for the

Royal Navy The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against F ...

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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