OSWEGO, N.Y. -- The wreck of a U.S. Air Force twin-engine plane that crashed into Lake Ontario more than 60 years ago has been found in deep water off upstate New York, a team of underwater explorers said Tuesday.

The Beach Aircraft C-45 flew for kilometres on its own after its three-man crew and two civilian passengers bailed out when one of the engines failed during a flight over central New York in 1952. The aircraft flew on automatic pilot for more than an hour before it crashed into the lake northwest of Oswego, on the lake's southern shore 55 kilometres north of Syracuse.

A trio of explorers from the Rochester area said they located the nearly intact plane in more than 45 metres of water while searching for historic shipwrecks on the lake's eastern end on June 27.

One of the searchers, Jim Kennard, said the C-45 was on a routine flight on Sept. 11, 1952, from Bedford, Massachusetts, to Griffiss Air Force Base in Rome, New York, when the left engine began failing about 80 kilometres from its destination. As the plane started to lose altitude, the pilot believed it would soon crash and ordered the other two Air Force officers on board and the two civilians to parachute from the aircraft at 760 metres.

Before bailing out, the pilot set the auto pilot on a course that would steer the plane clear of inhabited areas. All five landed safely.

The lightened plane gained altitude and changed course, heading out over open water. Witnesses reported seeing it crash into the lake about two kilometres off Oswego.

Two days of searches by Coast Guard ships and Air Force planes turned up no sign of wreckage.

Kennard said he, Roger Pawlowski and Roland Stevens were using side-scan sonar to survey the lake bottom when they discovered the plane wreck on June 27. Sonar images show the plane's nose and vertical stabilizers are missing, but otherwise the aircraft remains mostly intact.

The team was surprised when the sonar found the wreck farther from shore than what the witnesses indicated, Kennard said.

"All of sudden, 'ho, what's that?' he said. "Then you see the sonar image of the plane, then you say 'wow.'"

The wreck still belongs to the Air Force, which didn't have an immediate comment on the discovery.