Best known for his discovery of the wreck of the RMS <em>Titanic</em>, <em>Nautilus</em> expedition leader Dr. Robert Ballard is one of the world's most famous ocean explorers. In this webcast, we talk live with Dr. Ballard as he explores the Mediterranean's Straits of Sicily. Learn about the <em>Nautilus'</em> latest discoveries and the history of ocean exploration.