Water isn’t nearly as good a conductor of electricity as copper. The “path of least resistance” (which is a simplification I admit, but ELI5) causes the electricity to flow through the wires, turning the wheels, paddling the mostly-floating/slowly-sinking vehicle across a short region of water until the tires can get traction of the road on the other side.
While I object to the term [Tesla swimming](https://www.youtube.com/watch?v=cBYFo6fXPvU ) is a thing.
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