Green Marine UK has achieved Approval in Principle from the global classification society RINA for their maritime initiative, Project Verdant, which focuses on retrofitting crew transfer vessels (CTVs) with hydrogen fuel cells, fuel cells, and batteries to reduce emissions while servicing offshore wind farms. Phase 1 of the project, comprising a preliminary design and feasibility study, has been successfully concluded, indicating viability for subsequent project phases dedicated to design, engineering, and sea trials. The project aims to integrate hydrogen fuel cells with electric motors in CTVs, allowing for zero-emission operation at slow speeds while servicing wind farms. Notable partners in this endeavor include Waves Group, EMEC, Energys, and Engineered Marine Systems (EMS). The hybrid system's design is projected to potentially decrease CO2 emissions by up to 30% and NOx emissions by up to 40%. Green Marine UK is enthusiastic about the approval as it signifies the safety and compliance of the retrofitted vessels with UK regulations. The long-term vision involves leveraging the knowledge gained from operating retrofitted vessels to scale up Green Marine UK's fleet with newbuild zero-emission CTVs and service operation vessels (SOVs).