Germany has a great way to extinguish Tesla fires. They bring out a portable water tank. Begin filling it with a hydrant. Then they use a fork lift or crane to drop the entire car into the tank. Continue to fill it until batteries are submerged.
Results. Little water used, car poses no threat, public safety is assured and the portable water tank can be used again.
As EVs get more common, imagine this will become a routine proceedure for EV collisions.