A. P. Møller-Mærsk's newly developed design for an ammonia-fuelled 3,500 TEU container vessel has earned approval in principle (AIP) from classification societies Lloyd’s Register (LR) and the American Bureau of Shipping (ABS).Led by the Mærsk Mc-Kinney Møller Center for Zero Carbon Shipping, the design project also involved MAN Energy Solutions, Deltamarin, Eltronic FuelTech.