Short progress update:
* Resource carriers done, no more magical transport of needed resources
Fuel tank => pipe => engine room
Engine room => shaft => propellor
Engine room => shaft => generator
Generator => cable => battery
Pump room => pipe => balast tank (todo)
* Bunks doesn't generator 4 crew members of each type.
You need to recruit the correct amount of engineers, cooks, sonarman, radioman, torpedo man, officiers.
The recruiting capacity is limited by available beds & food.
Next will be the location of the crew at work / rest / eating time.