While the vehicle looks like a Countach, don't expect to listen to a sonorous Italian V12 on the open seas because power now comes from a Rover V8. In the water, a twin-prop drive runs from a power takeoff on the engine, and twin rudders allow for navigation. Hydraulics lift wheels when it's time to get wet. For wannabe Bonds, there's even a button inside to activate a smoke screen.
Some digging online shows that Mike Ryan of SeaRoader originally built the water-going Countach. Both the eBay ad and Ryan's page assert the supercar briefly went to Hollywood for various roles, but the Internet Movie Car Database only shows the Lambo appearing briefly in Top Gear's Season 8 amphibious cars episode. Ryan also helped the guys build their own floating vehicles.
Get ready for some hard work before setting sail. According to the listing, the carpets and seats are gone. The engine still turns, but the fuel pipe that goes to the tank needs replaced. It also requires new tires and brake work. If you're up to the challenge, this could be an amazing project.