Frédéric Dumas

[4] In 1956 he was one of the principal architects of the ground-breaking film The Silent World, in which his ballet with the grouper Ulysses (French: Jojo) is famous.

In 1946, Cousteau and Dumas dove into the karstic spring of Vaucluse, the largest in France (with an average flow of 22 m3 / second and ranked fifth in the world with 110 m3 / second during snow melt),[5] hoping to explain its annual flooding.

When Cousteau and Dumas became affected by carbon dioxide poisoning due to a faulty compressor setup,[3] Fargues saved their lives by pulling them back up to the surface.

[7] Dumas was one of the major players in the rescue of Professor Jacques Piccard's bathyscaphe, the FNRS II, during the 1949 expedition in Dakar.

In 1950, he invented what he called the collerette de sécurité (safety collar), the first buoyancy compensator, already fitted with a compressed-air reserve separate from the main cylinders.

Frédéric Dumas in 1948.
Plaque commemorating the filming of Par dix-huit mètres de fond with the Mousquemers : Cousteau, Dumas and Tailliez. Île du Gaou , Le Brusc , Six-Fours-les-Plages .