For Dr O. Castagna (Equipe Résidente de Recherche Subaquatique Opérationnelle, Toulon), Hélène Fournié created a series of medical illustrations explaining immersion pulmonary edema. This visual and educational design work compares three respiratory and circulatory states: at rest, using standard diving equipment, and using an experimental rebreather, highlighting the impact of diving gear on the diver’s body.