Ballard is an American oceanographer and marine geologist. While working at the Woods Hole Oceanographic Research Institution, he pioneered the use of deep-diving submersibles, took part in the first manned exploration of the Mid-Atlantic Ridge, and discovered warm water springs and the unusual animal communities that grow up around them in the Galápagos Rift. He is best known for his dramatic discovery of the wreck of the Titanic in 1985. What other notable wrecks has Ballard located? Discuss