MOIRAI, named after the three Greek goddesses of fate, stands as a pioneering project at the intersection of past, present, and future. MOIRAI weaves a comprehensive understanding of the ocean’s dynamics and biogeochemical cycles through advanced models, integrating historical data, current observations, and future projections. Integrated into the frameworks of Destination Earth (DE) and the European Digital Twin of the Ocean (DTO), MOIRAI will significantly advance our comprehension and mitigation of climate-related challenges.