< /ʒɑk iv/, 1910–97, French naval officer, author, and underseas explorer: developed the Aqua-Lung.
- Jacques Yves (ʒɑk iv). 1910–97, French underwater explorer
- French underwater explorer who helped develop the Aqua-Lung (an underwater breathing apparatus) and designed the bathyscaphe and a small, deep-sea submarine known as a diving saucer. Cousteau also devised an underwater television system and produced several films that widely popularized marine biology.