ArianeGroup, known for using liquid hydrogen in Ariane rockets, has initiated the NAVHYS project in collaboration with partners like Vard Design and North Star. The project, co-funded by the EU, aims to pioneer the use of liquid hydrogen (LH2) as an energy carrier for maritime transport, starting with offshore wind service operation vessels (SOVs). Liquid hydrogen is preferred for its energy density over gaseous hydrogen, but its storage requires maintaining extremely low temperatures, posing technological challenges. The project focuses on developing a concept for below-deck LH2 storage and fuel system to provide decarbonized maintenance solutions for wind energy providers. Integrating this technology entails significant adaptations on ships and maritime infrastructures. NAVHYS project, supported by the EU Clean Hydrogen Partnership, leverages expertise from various fields to drive shipping decarbonization and enhance energy efficiency. Over the next 36 months, the project will set milestones to develop and test the hydrogen fueled SOV system. Partners like ENGIE, INERIS, RISE, Bureau Veritas Marine & Offshore, LEITAT, and the University of Birmingham bring specific competencies to the project, ranging from hazard identification to life cycle assessment. North Star, committed to decarbonization pathways, will confirm the operability of the proposed design. The NAVHYS project represents a significant step towards reducing environmental footprints and improving energy efficiency in maritime transport through hydrogen fuel systems.