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The Coast Guard has ended the search for a Clearwater boater.

The Coast Guard believes it may have found the remains of a missing Clearwater boater who shared his story of a submarine sighting in the St. Petersburg Times.

David Schermerhorn, 48, was reported missing Saturday morning by the Monroe County Sheriff's Office after his 21-foot boat ran aground, unmanned, on Boca Chica Key.

The boat's dive flag was raised, and a line meant to attach the boat to an anchor was severed, the Coast Guard reported. Schermerhorn's wallet, briefcase and cell phone were found on board.

Search boats, an HH-65 Dolphin helicopter and an HU-25 Falcon jet dispatched to look for Schermerhorn discovered a person's remains, though detectives have yet to positively identify the person. With no new finds or information, the Coast Guard suspended its search Sunday night.

The last coordinates on the boat's GPS were 5 miles south of Key West, near the reefs of Middle Sambo.

When interviewed in June, Schermerhorn said he was an experienced boater, diver and fisherman who enjoyed amateur photography. Calling himself a "resolutionist" who worked at a company he identified only as "the Firm," Schermerhorn said he hoped to write a book on his experience viewing the nuclear-powered USS Georgia during a fishing trip.

Drew Harwell can be reached at or (727) 445-4170.