Navaleye,
I was onboard at the time and we had a couple of laughs because firstly, the handbrake was left on by the special effects man so the pneumatic ram didn't send the car anywhere near as far as it should. Secondly, the ship's AEO in charge of salvage had a whole exercise based around recovering the car after the event (it had flotation added), only for the thing to sink like a stone. Matelots do love it when a plan doesn't come together! (chuckle)
Cheers now