2. Robert Ballard: An American oceanographer and marine archaeologist. He is best known for discovering the wreck of the Titanic in 1985, as well as for his explorations of the hydrothermal vents and deep sea ecosystems.
3. Sylvia Earle: An American oceanographer, explorer, author, and lecturer. She is a National Geographic Explorer-in-Residence and has led more than 100 expeditions around the world. She is known for her research on marine ecosystems and her advocacy for ocean conservation.