One pilot is missing after two small airplanes collided in the air Sunday while flying over San Francisco Bay.

One of the planes managed to land safely while the other crashed into the water below, according to the Associated Press.

Would-be rescuers of the missing pilot have found debris in the waters of the San Pablo Bay but have so far come up empty-handed.

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KTVU.com reported:

The single-engine Cessna 210 and single-engine Hawker Sea Fury TMK 20 collided near San Pablo Bay around 4:05 p.m. Sunday. The Cessna crashed into the Bay, while the Hawker landed safely at Eagle's Nest Airport 40 miles away in Amador County.

Rescue crews responded and searched well into the night.

SFGate reported:

Four Coast Guard boats and a helicopter searched the choppy bay waters, along with five boats from local law enforcement agencies, including the Marin County Sheriff's Office and the Sausalito Police Department, as well as a local helicopter. Divers from the San Francisco Police Department also were on the scene.

It was unclear if the planes were part of the annual Pacific Dream Machines show, which was held nearby and includes aircraft in addition to “the world’s coolest cars.”

The FAA and National Transportation Safety Board are investigating, according to CBS.