What happened
During the takeoff phase of flight, the pilot reported that the left engine experienced a loss of power. This mechanical failure caused the aircraft to drift toward the left side of the runway. Due to the loss of power, the aircraft failed to achieve sufficient altitude to clear a construction crane positioned to the left of the runway.
The left wing of the aircraft struck the crane, leading to a descent that ended in an upright crash into the bay. The impact was severe enough that the left engine separated from the airframe during the accident; the engine was not recovered from the water. The pilot was not injured in the accident.