Our zero-boil-off system can be added to any liquid hydrogen storage tank to actively capture and reliquefy vapour, eliminating boil-off losses and maintaining cryogenic temperature without venting. For our lab-scale liquefiers, zero-boil-off is fully integrated, to keep liquid hydrogen in its liquid phase. Advantages include longer storage durations, improved safety from minimising pressure build-up, and reduced environmental impact through zero net emissions.