The crossword solutions for the term SEA, TO COUSTEAU are MER, which is the French word for sea. Jacques Cousteau was a French naval officer, ocean explorer, conservationist, filmmaker, innovator, scientist, photographer, author and researcher who studied the sea and all forms of life in water. He is known for his extensive work on marine conservation and his invention of the Aqua-Lung, which allowed people to explore the depths of the ocean.