Samuel L Jackson traces his ancestry to Gabon, visiting the coastal area of Loango National Park to see from where his enslaved ancestors were shipped in their millions to the Americas. But he wants to do more than tell the story of the enslaved who survived. The trans-Atlantic slave trade existed for well over 400 years, involving more than 45,000 voyages from dozens of outposts along the African coast. Over 2 million Africans died en route, and up to 1,000 slave ships ended up as wrecks, with only a handful ever having been identified. Jackson teams up with a group of underwater investigators who view the ocean floor as a graveyard and a crime scene. They dive the English Channel to find the 350-year-old wreck of an unidentified slave ship and discover its secrets. This is the oldest slave ship ever discovered, and deep on the dark ocean floor the divers make a remarkable find. (thetvdb.com)