Fabien Cousteau (born 1967) is a French aquatic filmmaker and oceanographic explorer. He is son of Jean-Michel Cousteau and grandson of the noted oceanographic explorer Jacques-Yves Cousteau. Born in Paris, he grew up in both France and the United States, and frequently accompanied his grandfather and father on their sea voyages. He graduated from Boston University.
His first known scuba dive was an hour and a half buddy-breathing with a family friend in a swimming pool on his fourth birthday.
Fabien Cousteau has made intensive study of sharks in their natural habitat, with the use of "Troy", a specially built "Trojan Shark" submarine designed and built by Eddie Paul of EPIndustries.com or Deadllinetv.net in the shape of a great white shark. He spent several hundred hours filming sharks in preparation for his documentary film on the subject, titled Mind of a Demon (CBS, June 28, 2006). He developed the idea of a shark-shaped submersible based on a childhood memory of the cover of a French-language comic book, The Adventures of Tintin: Le trésor de Rackham le rouge, which featured such a craft (which was purely imaginary at the time).