Scientists have unveiled a groundbreaking methodology that could revolutionize maritime transport by replacing traditional diesel engines with pneumatic propellers on ferry boats. According to a new study published in the journal Energy Conversion and Management, researchers successfully demonstrated that two air motors—each generating 250 kW of power—could effectively replace diesel engines. These pneumatic motors provided sufficient propulsion to operate a ferry on a fixed route within Finland’s maritime transport network, offering a cleaner, more sustainable alternative to conventional marine engines. The study was designed to assess both the technical and economic feasibility of implementing pneumatic propulsion systems on existing ferry boats. The authors’ proposed pneumatic propulsion system uses compressed air, held in high-pressure tanks and directed into a vaned air motor that drives a naval impeller.