[shagie]

That's not exactly a closed loop recycling system.

Additionally, flame is very restricted on a sub. You wouldn't be using any sort of methane to cook.

https://qr.ae/prgBKF

https://qr.ae/prgBsh

https://www.answers.com/Q/What_fuel_does_a_submarine_use_for...

[midoridensha]

The idea of using a combustible gas to cook is archaic and really dumb. It's amazing that people are still cooking this way today in many places. We've had better technology for ages.