The transport sector's focus on electric vehicles (EVs) is now being challenged by the emergence of alternative fuels like ammonia, hydrogen, and methanol in the maritime industry. Ammonia, known for its carbon-free attributes, is gaining attention as a promising engine fuel source due to its ability to transport hydrogen without emissions. Hydrogen engines, such as the BeHydro by ABC, are revolutionizing the maritime industry by offering high efficiency and up to 85% reduction in CO2 emissions. Methanol engines, adaptable and easy to store, are being retrofitted in existing engine models by companies like Wärtsilä, providing a flexible and sustainable fuel option. These advancements not only promote decarbonization but also ensure operational efficiency for vessels without compromising performance. The transition towards using these alternative fuels signifies a shift towards a more environmentally friendly maritime industry, with the potential to significantly reduce global emissions and combat climate change.