A massive search of the San Pablo Bay was underway Sunday after two small planes collided, one landing at an airport an hour away and the other dropping into the water, authorities said Sunday evening.

The collision between a single-engine Cessna 210 and a single-engine Hawker Sea Fury TMK 20 occurred about 4 p.m., authorities said. Each aircraft had only the pilot aboard, and the Hawker Sea Fury pilot was reportedly uninjured, KGO-TV Channel 7 reported. The condition of the Cessna pilot was unknown.

The Hawker Sea Fury, a British fighter aircraft, managed to fly about 45 minutes east and landed safely at the Eagles Nest Airport in Ione, in Amador County, said U.S. Coast Guard spokeswoman Loumania Stewart.

The Hawker Sea Fury is registered to Sanders Aeronautics, according to Federal Aviation Administration records. A man who answered the phone there Sunday night declined to comment. FAA spokesman Ian Gregor said both planes took off from Half Moon Bay Airport.

The Hawker Sea Fury was featured Sunday at the airport's annual Pacific Coast Dream Machines show, which includes cars, show planes and custom motorcycles.

The Cessna was at the show as well, but it was not immediately known if that plane was a registered participant.

The Cessna reportedly went down about a mile north of Brother Island.

Stewart said four Coast Guard boats and a Coast Guard helicopter were searching for the plane but so far had found only debris.

Five police and fire boats from various agencies were also assisting with the search, Stewart said. Private boaters also helped out at the start of the search.

Gregor said the FAA and the National Transportation Safety Board are investigating the collision.

Wire services contributed to this report.