In this photo provided by the Contra Costa County Office of the Sheriff on Monday, April 28, 2014, a buoy marks the spot in San Pablo Bay where the wreckage of a light plane was located near Richmond, Calif. A federal transportation safety official arrived Monday in Northern California to investigate a collision between two small planes that sent one crashing into San Francisco Bay. The collision occurred Sunday near the Richmond-San Rafael Bridge and involved a single-engine Cessna 210 and a single-engine Hawker Sea Fury TMK 20. (AP Photo/Contra Costa County Office of the Sheriff)