Jacques Cousteau was a renowned French naval officer, explorer, filmmaker, and scientist born in 1910. He is best known for his pioneering work in marine conservation and underwater exploration. Cousteau co-invented the Aqua-Lung, a device that allowed divers to breathe underwater, and he founded the Cousteau Society to promote marine research and conservation. Through his documentaries and television series, such as "The Undersea World of Jacques Cousteau," he introduced millions of people to the beauty and importance of the oceans. Cousteau's legacy continues to inspire environmentalists and oceanographers worldwide.