S4.E1 ∙ The Wild West Sun, Aug 01, 2021 Uncovered clues from a famous Montana battleground, a 19th-century steamboat and a frontier ghost town reveal surprising truths about the Wild West. 7.5 /10
S4.E2 ∙ The Battle for the Black Swan Sun, Aug 01, 2021 Archaeologists and treasure hunters battle it out over half a billion dollars worth of gold and silver. Who will win the Battle for the Black Swan? 7.6 /10
S4.E3 ∙ Arctic War Sun, Aug 01, 2021 From a long lost US base beneath the Arctic ice cap, to a sunken Soviet submarine, the Cold War's toxic legacy is both fascinating and terrifying. 7.8 /10
S4.E4 ∙ Hollywood Sun, Aug 08, 2021 From a buried film set to a WW1 Navy ship and old fishing barge, we discover the role these ruins played in Hollywood movie-making history. 7.5 /10
S4.E5 ∙ The First Americans Sun, Aug 08, 2021 Clues from a 13,000-year-old skeleton and a submerged coastline reveal surprising insights about the first humans to arrive in the Americas. 8.1 /10
S4.E6 ∙ Venice's Lost Empire Sun, Aug 08, 2021 A 14th-century galley entombed in mud, a 16th-century hoard of luxury cargo, and a gruesome discovery reveal the rise and fall of the Venetian Empire. 7.7 /10
S4.E7 ∙ The Mississippi River Sun, Aug 15, 2021 From a steamboat in a cornfield to the true story behind Hurricane Katrina's floods, new discoveries reveal how the Mississippi river shaped America. 7.8 /10
S4.E8 ∙ Hurricane Apocalypse Sun, Aug 15, 2021 Remnants of colonization attempts, a revolutionary refugee ship and submerged subway cars reveal hurricanes' impacts on America's past and its future. 7.9 /10
S4.E9 ∙ The Great Barrier Reef Sun, Aug 22, 2021 The mysterious sinking of Australia's "Titanic", a warship on a dangerous mission, and a ROV expedition searching for clues at the bottom of the reef. 7.8 /10
S4.E10 ∙ Sea of Secrets Sun, Aug 22, 2021 The Black Sea is a place of myth and legend and ships have sailed on its waters for millennia. Three wrecks unlock secrets of this mysterious sea. 7.7 /10
