@Rasp
>waterproof car
Yeah, good luck with that Einstein.
@thatguyoverthere @dave @Rasp
The answers to your questions are: no and nothing.
What Elon is looking for is an amphibious car, which is build completely different from the ground up and actually has a propeller to drive the "car" in water".
You could argue that all terrain vehicles exist that are able to deal with going through shallow water with no issues. But once again that is build different from a truck, and a shallow stream is not "rivers, lakes & even seas".