The overall objective of the project is to develop a virtual environment equipped with FAIR multi-disciplinary data and services to support marine and freshwater scientists and stakeholders restoring healthy oceans, seas, coastal and inland waters. The AquaINFRA virtual environment will enable the target stakeholders to store, share, access, analyse and process research data and other research digital objects from their own discipline, across research infrastructures, disciplines and national borders leveraging on EOSC and the other existing operational dataspaces (e.g., EMODnet, Copernicus Marine Service, Digital Twins, etc.).The initial level of the existing solutions for data access in marine domain are at the Technology Readiness Level (TRL) 7-8. Many services, such as Blue-Cloud data discovery and access service and NextGEOSS, have reached a maturity level, where they can already be seen as finalised end-user products in terms of usability.