"Jacques-Yves Cousteau" was a French navy/French naval officer, exploration/explorer, Conservation movement/conservationist, filmmaker, innovator, scientist, photographer, author and researcher who studied the sea and all forms of life in water. He co-developed the Aqua-Lung, pioneered marine conservation and was a member of the Académie française.
Cousteau described his underwater world research in series of books, perhaps most successful being his first book, The Silent World: A Story of Undersea Discovery and Adventure, published in 1953. Cousteau also directed films, most notably the documentary adaptation of the book, The Silent World, which won a Palme d'or at the 1956 Cannes Film Festival. He remained the only person to win a Palme d'Or for a documentary film, until Michael Moore won the award in 2004 for Fahrenheit 9/11.More Jacques Cousteau on Wikipedia.