Halon, or any other fire suppression system would be unworkable on a boat. There’s just too much stuff crammed inside for any kind of centralized system. You have to either stop a fire fast with a portable extinguisher or get at it with a fire hose.
And, BTW, any type of chemically based extinguishing agent requires a massive cleanup effort, especially on affected electrical components (of which there are many).
Thanks for the answer. Just plucking my thoughts since I know enough that fire is a great killer of subs and crews.
Now, correct me if I am wrong, but surface ships can flood compartments to control fire, such as what could have happened with the Iowa main armament magazines, and obviously water in the sub is bad (except trim tanks and such) but could a sub close hatches in the affected area, and remove the oxygen thus snuffing the fire?