Hydrogen fuel cell ships use hydrogen gas to generate electricity, which powers electric motors for propulsion. The process involves combining hydrogen with oxygen from the air in a fuel cell, producing only water and heat as byproducts. This makes them an environmentally friendly alternative to traditional fossil fuel-powered vessels. These ships are part of a growing trend towards sustainable maritime transport. Companies and researchers are exploring hydrogen technology to reduce greenhouse gas emissions and reliance on oil. Notable projects include the Hydrogenious LOHC Technologies and the Maritime Hydrogen Coalition, which aim to advance hydrogen use in shipping.