updated 8/19/2009 3:29:27 PM ET 2009-08-19T19:29:27

A treasure hunter on Cape Cod has brought ashore more booty from a sunken pirate ship, including two 300-year-old cannons first identified by John F. Kennedy Jr.

Barry Clifford recently recovered new artifacts from the Whydah. Kennedy helped Clifford explore the wreck after it was located off Wellfleet in 1984.

Clifford says Kennedy used to draw pictures of the cannons. Kennedy dove off and on near the shipwreck until his death in a plane crash in 1999.

Clifford said divers also discovered a plastic compass with the initials "J.F.K." near the cannons in 2007. He says the compass must have ripped off Kennedy's diving suit more than 20 years ago.

Historians say the Whydah sank in a fierce storm in 1717.

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