In a groundbreaking development, the Japanese classification society ClassNK has granted Approval in Principle (AiP) for a revolutionary design concept of an oil tanker that utilizes liquefied hydrogen as its primary fuel source. This landmark achievement, achieved through collaboration between Uyeno Transtech, Yanmar Power Technology, and Mitsui E&S Shipbuilding, represents a significant step towards realizing zero-emission ships in the maritime industry. The project, initiated as part of the 'Development of Large-scale Hydrogen-fueled Domestic Tanker and Demonstration of Zero-Emission Ships' initiative by the Nippon Foundation, has garnered global attention for its innovative approach to clean fuel alternatives. ClassNK's rigorous review process, incorporating key guidelines such as the IGF Code and specific regulations for ships using hydrogen as fuel, underscores the commitment to safety and efficiency in adopting hydrogen technology. This milestone not only paves the way for future hydrogen-powered vessels but also underscores the industry's shift towards environmentally sustainable practices. The recognition of the design concept not only validates the technical feasibility of hydrogen as a marine fuel but also highlights the growing emphasis on reducing emissions and promoting eco-friendly solutions in the marine transportation sector. ClassNK's proactive role in endorsing this groundbreaking project signifies a positive outlook towards the integration of hydrogen technology in the maritime industry, setting a new standard for environmentally responsible shipbuilding and operation.