The next shot shows the car leaving the flat area and heading back towards the main road past the beach that once had the concrete ramp. Despite the current tree growth it is quite easy for me to recognise this area. I've included a similar angle from Streetview below.
This isn't the last time we see this road though as the bad guys return later to dispose of a car (complete with requisite drugged victim placed in the driver's seat). They stop the car at a lay-by (it's a single lane road and so has lots of passing places).
They dump the car...
...and then drive off again.
Now, this got me thinking. There is (or perhaps was...it's been a while since I dived there) an old car wreck in the middle of this side of Lobster Bay. It wasn't a modern car either, quite old and in fact was really just the collapsed wheels and steering column - no body and very little chassis left. It's possible that the car wreck in Lobster bay may be this very same car dumped into the bay for the purpose of this film. For a long time people have assumed it was a car that fell off one of the old fast smuggler's speedboats but the age doesn't seem to tally with the time frame. So, if there are any car experts out there who can identify the make and model of the one in the picture above (HK 2358) it might be possible to compare the two to see if they match. My hopes aren't high but it would certainly explain the reason for the car's presence in the bay.