Titanic's Last Secrets: The Further Adventures of Shadow Divers John Chatterton and Richie Kohler (Thorndike Press Large Print Nonfiction Series)

A famous diving duo turn their investigative skills to the question of why the Titanic sank as quickly as it did, describing how they assembled a team of experts and dived to the wreck of her sister ship, Britannic, and discovered previously hidden flaws.