Glosten, a Seattle-based naval architecture and marine engineering firm, has achieved an Approval in Principle from the American Bureau of Shipping for the design of UC San Diego's Coastal-Class Research Vessel (CCRV), a groundbreaking hydrogen-hybrid research vessel. The CCRV, to be operated by Scripps Institution of Oceanography, will utilize a cutting-edge propulsion system powered by hydrogen fuel cells, enabling zero-emissions operation during 75% of its missions. This project represents a significant milestone in the maritime industry's transition towards sustainable practices. The vessel's design process involved careful consideration of regulatory compliance, particularly regarding the use of liquid hydrogen, and collaboration with industry partners to define safety standards. ABS's approval not only validates the technical viability of the CCRV but also signals broader acceptance of hydrogen-fuel-cell propulsion for medium-sized coastal vessels. Beyond its environmental benefits, the CCRV aims to provide a world-class research platform for Scripps researchers and students, aligning with the institution's commitment to environmental stewardship. Additionally, the vessel will play a crucial role in hands-on education, offering valuable seagoing experiences to train the next generation of marine scientists, leaders, and policymakers. The project is currently advancing towards a functional-level design, with plans to initiate construction soon. Through the collaboration of key stakeholders and the utilization of innovative technologies, the CCRV sets a new standard for sustainable marine research and education.