I wonder if you could design a keel with semi-permanent "slots" for the battery packs. They're going to weigh an incredible amount, so they'll probably need to

I wonder if you could design a keel with semi-permanent "slots" for the battery packs. They're going to weigh an incredible amount, so they'll probably need to be as low as possible, and partial surface contact with the ocean would help with the incredible cooling requirements. Fire starts, pod immediately drops into the ocean? There's no real way to put out a lithium fire of that size, even if you extinguish it, it may start again days later. Has to go overboard one way or another.