All day long, I’ve had the recurring thought: “CO2 fire extingushers. If oil or liquid fuels are involved, water can often spread a fire. CO2 would starve the fire of oxygen and end it. Just spitballing.
The problem with that is that if the CO2 extinguisher can’t put the fire out, it has also done nothing to cool the hull, bulkheads or deck. Radiant heating through those surfaces can cause ignition of substances on the other side without the fire actually getting past it. If you flood the fire with water, you cool those structures even if the fire isn’t extinguished.