One of the 1st EV fires I ever read about reported the fire department put 32 THOUSAND gallons of water on the fire and it STILL wouldn’t go out....so they eventually resigned to just controlling the area and letting it burn itself out......what a terrific design feature!
There other thing my local volunteer fire department guys were discussing was when they started making cars with magnesium wheels. When those would catch on fire it was really tough to put the fire out.
Materials that bring along their own oxygen supply are impossible to extinguish with water. Like those underwater flares. Fire departments should know that. Looks like they wasted 32k gallons of water.