In the framework of ERASMUS+ project entitled “Supporting the development of socially inclusive Blue Challenges in schools in the Mediterranean sea-basin” (BlueS_Med), a training event for 45 teachers and pupils of elementary and high schools from four Mediterranean countries (France, Italy, Malta, Greece) took place in the premises of the Hellenic Centre for Marine Research in Crete between 5 and 8 May 2022. The aim of the project is to develop innovative science-based and ocean related educational material addressing ocean/marine issues building on previous experiences from schools and school partners, using benchmarking exercise as a reference, co-building with children, teachers and school partners. The training event included workshops, labs and field work organized by the Educational Teams of HCMR and Cretaquarium for the students and the teachers that participate in the project, a tour at the Cretaquarium, and a tour at the Archaeological Museum of Heraklion with emphasis on exhibits related to marine life of Minoans.