Local Lee Dolby, 40, filmed the swimmer battling to retrieve his sunken vehicle.
The beach clip starts with the car floating half-submerged in water.
A man on a jet ski rides around the wreckage and Lee zooms in on the vehicle as it bobs in the current.
Another person in a life jacket attempts to get hold of the vehicle and Lee says: “That geezer’s just lost his car.”
A third man then comes out into the water carrying a tow rope and attaches it in front of a crowd of onlookers who have gathered nearby.
Lee’s two sons Harry, 13, and Charlie, 9, watch apprehensively before he turns the camera back to reveal the car which continues to sink.
Another video taken shortly after shows the rescue operation, with the drenched car being hauled ashore.
Lee took to social media to share the unbelievable moment, posting the video captioned: “Just popped down the beach for an hour with the boys and see this fella trying to unload his jetski and parked a little too close.
“Couple of waves came and claimed his car!”