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Famed oceanographer Jacques Cousteau is seen inside his SP-350 Denise submersible, aka the Diving Saucer. Followed by underwater footage showing a wide shot of the submersible, At Sea, 1968. Jacques-Yves Cousteau, AC was a French naval officer, oceanographer, filmmaker and author. He co-invented the first successful open-circuit self-contained underwater breathing apparatus, called the Aqua-Lung, which assisted him in producing some of the first underwater documentaries. The SP-350 Denise, famous as the "Diving saucer" (Soucoupe plongeante), is a small submarine designed to hold two people, and is capable of exploring depths of up to 400 metres (1,300 ft). It was invented by Jacques-Yves Cousteau and engineer Jean Mollard at the French Centre for Undersea Research. It was built in the year 1959 and usually operated from Cousteau's ship, the Calypso.