> You have an unlimited amount of water with which to fight any fires

Fire on a ship is extremely dangerous. Think about what your training and your first instincts both tell you to do if there's a serious fire. Where I am the training starts with four words: "Get out. Stay out". But you can't just leave a ship, in the ocean you will drown. Even lifeboats, if they're available and can be used, are much more dangerous than we'd like.