This guide is made for BTE, or Barotrauma Extended, the mod. If anything substantial changes, I will update this guide.
I'm making this since I'm tired of people blowing up my subs as I shout at them "DID YOU PUT COOLANT IN THE REACTOR" and they go "YOU ONLY NEED ONE ROD"
I've done my best to color code it and liberally use bold and italics to keep it from getting boring. If something is bolded or coloured, I strongly suggest you read it, as it's probably important. See the bottom for some ADVANCED TIPS
Part I: The Reactor (or, "the part of the guide that triples in size of the rest of its contents")
The Reactor is the most important part of the submarine.