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> ammonia is way too dangerous

The thought of working in the confines of a ship's engine room with such a hazardous fuel is horrifying. One reason for the widespread use of diesel oil is that it's relatively safe for human operatives.

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Engine rooms on these ships have large extractors and ventilation systems.

I'd look at that as "look how large of fans we need to make diesel safe", not "we have big fans and thus can use ammonia".

Carbon monoxide is very dangerous. Removing that to replace it with the risks from ammonia could be a net improvement.

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