Euro-Argo started on January 2008 as a project aiming the development of an European “infrastructure” for Argo. Euro-Argo involved 25 organizations from 12 countries, including the mayor European contributors to Argo. In 2011 Euro-Argo started a transition phase that ended in 2014 with the setting up of the Research Infrastructure Consortium (ERIC) that was the starting point of a new European contribution for the long term operation (> 10 years) of Euro-Argo.