<h1>Approval in Principle confirms technical viability and regulatory alignment for an ammonia-as-hydrogen PEM fuel cell vessel concept.</h1> Approval in Principle was obtained for an ammonia-fuelled LR2 tanker concept integrating a modular PEM fuel cell propulsion and power system paired with an upstream Ammonia Cracking System, confirming technical viability and alignment with classification society safety and regulatory standards and establishing foundational safety concepts and a regulatory framework for ammonia-as-hydrogen-carrier applications in large commercial vessels.