David Mearns, Guinness World Records holder and award-winning author of "The Shipwreck Hunter," joins the Speaker to talk about some of Mearns' most notable deep-sea shipwreck discoveries and investigations. Mearns' expertise served in the historic conviction of an Austrian businessman who planted a time bomb on the Lucona, which killed half the crew, in a conspiracy to commit murder and collect millions in insurance. Mearns also shares how shipwreck hunting has allowed him to bring closure to families who have lost loved ones out at sea. Listen to the end of the episode for an exciting update about a famous shipwreck discussed in the conversation, Sir Ernest Shackleton's Endurance.