It would take a coupla tons of wet sand to put out a lithium fire like that. Squirt water on it and it’ll explode bigger.
FIREFIGHTING
USE WATER TO FIGHT A HIGH VOLTAGE BATTERY FIRE. If the battery catches fire, is exposed to high heat, or is generating heat or gases, use large amounts of water to cool the battery. It can take approximately 3,000 gallons of water, applied directly to the battery, to fully extinguish and cool down a battery fire; always establish or request an additional water supply. If water is not immediately
available, use dry chemicals, CO2, foam, or another typical
fire-extinguishing agent to fight the fire until water is available.
https://www.tesla.com/firstresponders
“Squirt water on it and it’ll explode bigger.”
Water was used to successfully extinguish all fires during the suppression tests;
https://www.sfpe.org/page/2014_Q2_3
I believe wet sand contains water.