The Lunar-class example is given an approximate mass of 28 megatons, with reactors said to account for about 20 percent. That is a mass estimate, while the accompanying point about accommodation is that machinery and gun decks occupy much of the usable interior. Unregistered inhabitants can settle in the lower decks, including groups that survive by hunting vermin. Troops aboard a ship trapped in the warp for fifty or sixty years may become part of its society and be absorbed into the ship's fighting personnel. A comparison with modern warships and ships of the line then distinguishes the amount of space from how comfortably it is used. Even very large hulls can have dense populations, particularly when the people aboard extend beyond the official crew list.
Notable Point · 3:51:18-3:55:07
Machinery and unofficial residents fill Warhammer's lower decks
Reactor mass, occupied working spaces, and unofficial inhabitants complicate simple estimates of a fictional warship's population density.