JT 12/13 Provence-Alpes reports from 9 June 2022 (from 9'05') and Made in Marseille on the demonstration Light from the sea organised on the Plage des Catalans by the Musée Subaquatique de Marseille, IMERA, MIO, INP Marseille, Aix-Marseille Université, CNRS & IRD to mark the 30th anniversary of World Ocean Day on 8 June.