Naval architecture and marine engineering company Glosten has received approval in principle (AiP) from the American Bureau of Shipping (ABS) for the design of UC San Diego’s hydrogen-hybrid coastal-class research vessel (CCRV). The vessel, set to be the world's first hydrogen-hybrid CCRV, will be operated by Scripps Institution of Oceanography and will feature a propulsion system powered by hydrogen fuel cells for zero-emissions operation. The approval demonstrates that the CCRV design meets ABS’s technical requirements and safety standards, paving the way for the utilization of hydrogen-fuel-cell propulsion in medium-sized coastal vessels. Once operational, the CCRV is expected to conduct missions using emissions-free hydrogen fuel cells for 75% of its operations, allowing researchers to study the marine ecosystem along the California coast sustainably. Additionally, the vessel will serve as a platform for hands-on learning and training the next generation of marine scientists, leaders, and policymakers. Glosten's successful design approval signifies a step forward in integrating environmentally friendly technologies into maritime operations while ensuring safety and adhering to regulations. The project team is now focusing on refining the vessel's design to a functional level and supporting Scripps in soliciting construction proposals, showcasing a commitment to innovation in green maritime solutions.