The RAstar 4000-DF (dual fuel) tugs by Sanmar are among the world's most high-performance escort tugs, capable of generating approximately 200 tonnes of indirect forces. These environmentally-friendly and powerful tugboats can run on diesel or LNG, featuring a diesel exhaust after-treatment system that complies with IMO Tier III emissions standards, the most stringent in the international marine industry. A major advance towards sustainability lies in their ability to perform long-distance escort missions solely using LNG, significantly reducing emissions, especially CO2, compared to even Tier III standards. Operating primarily on natural gas, these tugs achieve remarkable emissions reductions compared to conventional diesel tugs of the same power.