Blue-Cloud addresses the IA ‘The Future of Seas and Oceans Flagship Initiative’ (BG-07-2019-2020) for the following topic: [A] 2019 - Blue Cloud services. The project implements a practical approach to address the potential of cloud based open science to achieve a set of services identifying also longer term challenges to build and demonstrate the Pilot Blue Cloud as a thematic EOSC cloud to support research to better understand & manage the many aspects of ocean sustainability, through a set of five pilot Blue-Cloud demonstrators. It seeks to capitalise on what exists already and to develop and deploy, through a pragmatic workplan, the pilot Blue Cloud as a cyber platform bringing together and providing access to: 1) multidisciplinary data from observations and models, 2) analytical tools, & 3) computing facilities essential for key blue science use cases. Outputs include: a Blue Cloud Framework, Data Discovery & Access Service (approx. 400 users) & VRE (approx. 1,000 users) from 25 countries, Blue Cloud Service Catalogue including 50+ services deployed through 5 compelling pilot demonstrators, A Blue Cloud 2030 implementation Policy Roadmap, Whitepaper on outcomes of the Food/Blue-Cloud Pilots to support the implementation of thematic EOSC, 4 focused Roadmap events & Workshops, 1 hackathon, 10 webinars, 1 Final results conference, engaged community with all stakeholder groups represented. Led by a consortium bringing together leading European marine data management infrastructures, EOSC horizontal e-infrastructures, and excellent marine researchers. Coordinated by a neutral ICT intensive SME with over 15 years’ experience, technically coordinated by a community leading marine & ocean data specialist, and supported by 17 experienced partners, from research, academia & industry, with strategic and practical involvement in design and delivery of blue community needs. An influential External Stakeholders Experts Board & an Expert Foresight Group support the project.