I see that they now do a Haynes Manual for nuclear submarines.
OK, I surmise that it is in fact NOT a DIY maintenance/repair guide.
I recall a few years ago, when the Royal Naval Engineering team (at Edinburgh Tattoo) Took the record for changing a mini engine. I think it took them 22 seconds!
Can't get it out of my head: the image of that same team scratching their heads as they pore over the Haynes Manual, with their submarine in pieces all around them.