Season 4
8 episodes · first aired 2021-08-02
| Still | # | Title | Overview | Air date | Rating |
|---|---|---|---|---|---|
 | 01 | The Wild West 2021-08-02 | Uncovered clues from a famous Montana battleground, a 19th-century steamboat and a frontier ghost town reveal surprising truths about the Wild West. | 2021-08-02 | 4.0 |
 | 02 | The Battle for the Black Swan 2021-08-02 | 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? | 2021-08-02 | 6.0 |
 | 03 | Hollywood 2021-08-09 | 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. | 2021-08-09 | 4.0 |
 | 04 | The First Americans 2021-08-09 | Clues from a 13,000-year-old skeleton and a submerged coastline reveal surprising insights about the first humans to arrive in the Americas. | 2021-08-09 | 5.0 |
 | 05 | Venice's Lost Empire 2021-08-09 | 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. | 2021-08-09 | 5.0 |
 | 06 | Hurricane Apocalypse 2021-08-17 | Remnants of colonization attempts, a revolutionary refugee ship and submerged subway cars reveal hurricanes' impacts on America's past and its future. | 2021-08-17 | 4.0 |
 | 07 | The Great Barrier Reef 2021-08-23 | 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. | 2021-08-23 | 4.0 |
 | 08 | Sea of Secrets 2021-08-23 | 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.Remnants of colonization attempts, a revolutionary refugee ship and submerged subway cars reveal hurricanes' impacts on America's past and its future. | 2021-08-23 | 5.0 |
Ratings shown are community scores. Once OMDB is wired, these become per-episode IMDB values.