The mechanical shark frequently malfunctioned, due to the hydraulic innards being corroded by salt water. Bomb malfunctioned and did not explode. This was necessary as the V-2 sometimes malfunctioned and exploded on the launch pad. Signals malfunctioned, causing another train to rear-end the stalled train. On 20 September 1965, the destroyer 's steering malfunctioned and collided with "Hornet" while refueling. Investigation later confirmed that the Soviet satellite warning system had indeed malfunctioned. At once an explosion was heard from above&colon; the gun had malfunctioned. The report stated the samples were likely among those destroyed when a freezer malfunctioned. Some reports said that the buoy had repeatedly malfunctioned and had been welded in place. A year later, the park's roller coaster also malfunctioned, injuring twelve people. He reportedly survived a training jump in which both of his parachutes malfunctioned. Others claimed that the brakes or the thrust reversers malfunctioned. The Atlas malfunctioned in flight and the ATV failed to reach orbit. Investigation of the satellite warning system later determined that the system had indeed malfunctioned. An RCS heater also malfunctioned during the flight.