HD Korea Shipbuilding & Offshore Engineering (HD KSOE) has made significant advancements in liquefied hydrogen storage technology in partnership with DNV and major classification societies. The company's vacuum insulation system for liquefied hydrogen storage tanks has received approval in principle, along with approval for its welding procedure specification. This development addresses the challenges of designing and constructing large liquefied hydrogen storage tanks for ships, a crucial aspect of hydrogen commercialization. Through the joint project with DNV, HD KSOE has established detailed standards for these tanks, ensuring safety and efficiency. The vacuum insulation system enables tanks to maintain a vacuum state even at extremely low temperatures, reducing the boil-off rate of liquefied hydrogen. Additionally, the time taken to create the vacuum has been significantly shortened, enhancing the practicality of hydrogen transport by sea. This progress signifies a positive step towards the wider adoption and commercialization of hydrogen as a clean energy source.