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Da fuq
Yeah, I was expecting it to be much more than flying (water has more drag than air, what with Atlantic sea water being about 2500 times as dense as the air at cruising altitude), but 10 times was news. Cruise ship just aren't built for minimum fuel consumption the way aircraft are.
I guess if you reduced the accommodation to airliner levels, you could build a ship with similar fuel burn per passenger mile, but it's bad enough for 8 hours, never mind 8 days 🤮
Da fuq