Convert crewmembers to fertilizer until you reach equilibrium.

Which videogame have you been playing? This comment seems a bit off-brand.

Crafting Humans.

Sometimes you gotta branch out of your personal style a little. :)

Sunless Sea

I thought you can (with Toyota?). As long as you do not drive it that much. But aircraft carrier need not just fluid. Well if you persevere a bit can the nuclear plant just do thing important whilst the ship is parked somewhere.

I think that analogy is a bit of an exaggeration, gardens can be surprisingly space efficient if you plan well. It might still be too little for the whole crew, but it'd feed a lot of people for sure.

From a calorie perspective I don't think that's true. If you grow all potatoes which are one of the more efficient calorie/acre crop you have approximately: 90 days for 1 crop at ~15e6 kcal/acre. Nimitz class aircraft carrier has a surface area of ~1 acre and a crew of about 6000 people requiring ~10.8e6 kcal per day. So after 90 days of growing potatoes you would have about one days worth of food, or enough to feed ~66 people continuously. Of course you could always fish...