Comment by sparklysoup

8 hours ago

700-ish tonnes - it's in the wikipedia article:

"In 2020, Buquebus originally commissioned Incat to deliver a new ship to use dual-fuel propulsion, capable of operating on liquefied natural gas and diesel, with around 400 tonne of main engines, 100 tonne gearboxes, 100 tonne cryogenic fuel tanks and 100 tonne fuel."