In Europe, hydrogen is part of the EU’s long-term strategy to become carbon neutral by 2050. Fully electric and electric-hybrid ships already operate in several countries, including Norway, and now a new project aims to build a zero-emission prototype vessel running on liquid green hydrogen (LH2).
https://www.ship-technology.com/analysis/hydrogen-vessel/
https://www.offshore-energy.biz/worlds-first-hydrogen-powered-ships-one-step-closer-to-reality/