Seattle-based Glosten has secured an Approval in Principle (AIP) for the design of UC San Diego's new hydrogen-hybrid research vessel, the Coastal-Class Research Vessel (CCRV). This vessel, to be operated by Scripps Institution of Oceanography, will utilize hydrogen fuel cells for zero-emissions operation, showcasing a promising shift towards sustainable maritime practices. Glosten, in partnership with Siemens Energy, overcame regulatory complexities by aligning the vessel's design with strict safety standards and environmental goals. The collaboration also involved a risk assessment workshop and close work with regulatory bodies to define a framework for safely using liquid hydrogen aboard a research vessel. The Approval in Principle not only validates the CCRV design's technical feasibility and safety but also signifies a milestone in showcasing hydrogen-fuel-cell propulsion for medium-sized coastal vessels. With a focus on studying the marine ecosystem along the California coast, the CCRV will prioritize emissions-free operations for the majority of its missions, substantiating its environmental commitment. Additionally, the vessel will serve as a crucial educational platform, providing invaluable seagoing experiences for students at UC San Diego and nurturing the next generation of marine scientists, leaders, and policymakers. Looking ahead, the project team is advancing the CCRV towards a functional-level design and aiding Scripps in the construction solicitation process. By integrating innovative hydrogen technologies with cutting-edge research capabilities and educational initiatives, the CCRV project embodies a holistic approach towards advancing oceanographic research while fostering environmental sustainability and education.