Lithium ion batteries burn like magnesium flares when they are damaged. I mean the car sized ones burn like 500 pounds worth of magnesium flares. All the rubber, the seats, the upholstery, his clothes, virtually everything will turn to flame when subjected to the heat produced by a lithium ion battery pack destroying itself.
There are videos on youtube showing what happens when you damage a lithium ion battery. I wouldn't want to be anywhere near one large enough to power a car.
Isn’t that one of the dive boat sinking theories?
My personal favorite: https://www.youtube.com/watch?v=Nj7wQfxKLQo