Why is there a "graveyard of ships" near Naples?

In 2008, the Aurora Trust began a survey around an island named Ventotone, off the coast of Naples. They found an astonishing group of Roman shipwrecks, and they also found a mystery. How did all these ships sink so close together? Tune in to find out. Learn more about your ad-choices at https://news.iheart.com/podcast-advertisers