At TUGTECHNOLOGY '25, CMB.TECH's managing director and chief engineer discussed the rationale behind choosing hydrogen as the fuel for harbour tugs. Hydrogen's advantages for smaller vessels include lower emissions and improved air quality, aligning with the company's focus on reducing CO2 in maritime operations. Detailed engineering protocols and safety measures are essential due to hydrogen's characteristics. CMB.TECH has successfully demonstrated hydrogen integration in vessels like Hydrocat and Hydrotug, emphasizing operational feasibility. The safety standards for hydrogen storage and bunkering are designed to comply with international regulations, ensuring stability and manoeuvrability of the tugboats. To maximize efficiency, CMB.TECH has developed innovative refuelling systems and aims to collaborate with ports for robust bunkering solutions. Risk-based certification and maintenance protocols emphasize safety and reliability, with plans to substitute diesel fuel with hydrogen to achieve significant CO2 reductions. The company's commitment to advancing hydrogen technology in maritime operations is evident through its proactive approach to safety, maintenance, and performance verification.