Mark your calendars for the 4th edition of the EMODnet Open Sea Lab (OSL) Hackathon, happening online from 25 to 27 March 2025. The hackathon builds on the last 3 successful editions, with one key difference: In addition to using EMODnet services, participants will be given unparalleled access to the EMODnet and Copernicus Marine Service offer via the European Digital Twin Ocean infrastructure (EDITO).