HD Hyundai Heavy Industries has successfully developed the world's first ammonia dual-fuel engine, a major breakthrough in eco-friendly shipbuilding. The engine, named the ‘HiMSEN Ammonia Dual-Fuel Engine,’ utilizes a high-pressure ammonia direct injection method, marking a significant advancement in engine technology. Following model-based class approval from seven major classification societies, including ABS, DNV, and LR, Hyundai is poised to commercialize the engine for marine and land-based power generation. The engine's high output, fuel efficiency, and reduced greenhouse gas emissions make it suitable for various applications. Hyundai overcame technical complexities by implementing a high-pressure direct injection method that optimizes burning rates and reduces nitrogen oxide and unburned ammonia through SCR technology. Additionally, the company's Integrated Scrubber has successfully reduced ammonia concentrations. The development of this ammonia engine demonstrates Hyundai's commitment to innovation and environmental sustainability. Hyundai aims to lead the eco-friendly shipbuilding market by leveraging its advanced technology and expanding its dual-fuel engine lineup.