It’s an odd thing, but it seems all the images of potential autonomous ships seem to be missing a somewhat vital component? The exhaust stack?
Surely, they must still have some form of engine which will need some sort of exhaust system. Whilst there would be no need for accommodation to take up space, or or a bridge for navigation in harbour, how does the engine draw in air and ventilation then deal with the exhaust?
Or will they also be battery powered?