Are there any confirmed cases of EV battery fires causing loss of ships? I know there are lots of rumours, but they usually turn out to be false. Like the one about Luton Airport car park, which turned out to be a fossil.
In any case, LFP batteries don't have the same issues with releasing oxygen to keep the fire self sustaining. For a start the cathode doesn't have a negative temperature coefficient, so the main cause of thermal runaway is eliminated. Manganese dioxide has stronger bonds than cobalt, so oxygen is released much more slowly, at a rate which cannot sustain a fire. They don't experience expansion to nearly the same degree either, so mechanical safety sealing is unlikely to fail.
They are very resilient oxygen loss in general, so an exothermic reaction is very unlikely. They don't decompose at high temperatures either.
All that adds up to make them less likely to catch fire than an ICE, and if they do the fire it can be put out with water. Here's a video demonstrating that: https://www.youtube.com/watch?...
Note that you only see flames because they are exposed to the air, not in a sealed battery pack, and water works to extinguish it. Most of the burning is the wiring and the plastic housing, not the battery cell itself. And that's after they attacked it with power tools.