Bureau Veritas Marine & Offshore (BV) has joined the NavHyS project, a European initiative aimed at promoting the use of liquid hydrogen (LH₂) in maritime settings. The project, funded by the Clean Hydrogen Partnership and comprising a consortium of 14 European partners, is dedicated to decarbonizing the shipping industry. BV, along with ArianeGroup, has been instrumental in shaping the project proposal and structure, leveraging its expertise in safety, rule development, and classification to drive innovation in hydrogen-fuelled vessels. The focus of NavHyS lies in utilizing below-deck Type C LH₂ tanks as marine fuel for service operation vessels (SOVs), a technically challenging aspect of hydrogen deployment at sea. BV will provide three Approvals in Principle (AiPs) through its Design Assessment activities, covering liquid hydrogen storage, fuel systems, and their integration into SOVs. Additionally, BV will lead safety research and rule development specific to liquid hydrogen in maritime environments. The project will also explore shore-based hydrogen supply solutions and assess the lifecycle of hydrogen-fuelled vessels. NavHyS, which commenced in January 2025 with a €5 million EU contribution, is anticipated to achieve Technology Readiness Level 8-9 by 2030, paving the way for scalable deployment by 2035-2040. By merging expertise from the maritime and space sectors, NavHyS aims to introduce a groundbreaking concept for SOVs supporting offshore wind farms. The envisioned design includes storage tanks of 200-300 m³, capable of transporting significant amounts of liquid hydrogen to enable up to 10 days of autonomous operation. ArianeGroup coordinates NavHyS, bringing together prominent organizations and LH₂ experts to drive forward the adoption of this innovative technology in the maritime industry.