VW DID make a vehicle that went on land and water. It had a snorkel and some manner to keep water out of the engine bay. You had to stop the vehicle and turn the engine off. Then connect the propeller and shaft to the engine. I believe it was called a Shwimwagen.
Allen Caron
VW based 53MGTD - "MoneyPenny"
"If one thing matters, everything matters" - from the book The Shack