JASMIN supported over 40 hackathon attendees to help improve their data analysis skills with high-resolution ocean data. The hackathon made use of the JASMIN notebook service, group workspace storage and processing simulations on the LOTUS batch processing cluster. The EERIE project is developing improved Earth system models, harnessing Europe’s pre-exascale computers and considering European ocean mesoscale eddies in preparation for the next Intergovernmental Panel on Climate Change report. The project’s first General Assembly, held in Germany, saw 43 project members from 15 different project partners attend an extra two days for the project’s first hackathon. The aim of the hackathon was for participants to get to know each other while looking at some of the initial EERIE high-resolution eddy-resolving simulations and to gain experience using some relevant software tools. ...