Six 2m portrait masks of Cannes residents, a fisherman, an 80-year-old, a schoolchild, each split down the middle to form a…Six 2m portrait masks of Cannes residents, a fisherman, an 80-year-old, a schoolchild, each split down the middle to form a swim-through. In 3-5m of clear Med water over posidonia and sand; the whole museum is a free snorkel. Opened February 2021, Jason deCaires Taylor's first French work and the only major underwater museum that is free and snorkel-accessible to anyone. The split masks reference the island's history as a prison, the Man in the Iron Mask was held in the fort above. Anchorage: Anchor in the Sainte-Marguerite channel (posidonia-protected zones, check the chart) and swim in; site is closed to boats. Hazards: Anchor in the Sainte-Marguerite channel (posidonia-protected zones, check the chart) and swim in; site is closed to boats. Plus