7.65 avg 11 episodes 7.7 → 7.1 47 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Nazi Secrets | 7.7 | 134 |
| 2 | Gulf of Mexico | 7.6 | 112 |
| 3 | Lost Worlds of the Mediterranean | 7.5 | 109 |
| 4 | Sunken Treasures | 7.7 | 96 |
| 5 | Legends of Atlantis | 7.2 | 117 |
| 6 | Deadly Pacific | 7.7 | 107 |
| 7 | Egypt's Lost Wonders | 7.9 | 96 |
| 8 | Mysteries of the China Seas | 7.8 | 80 |
| 9 | Ultimate Battleships | 8.0 | 83 |
| 10 | Malaysia Airlines 370 | 8.0 | 107 |
| 101 | Villains of the Underworld | 7.1 | 22 |
7.83 avg 15 episodes 8.1 → 7.8 47 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Secrets of D-Day | 8.1 | 82 |
| 2 | Secrets of New York City | 7.6 | 79 |
| 3 | Killer U-Boats | 7.9 | 61 |
| 4 | Buried Secrets of the Gold Rush | 7.8 | 57 |
| 5 | Secrets of the Civil War | 8.1 | 59 |
| 6 | Lost Nukes of the Cold War | 7.5 | 72 |
| 7 | Secrets of the Spanish Armada | 7.6 | 65 |
| 8 | Pacific War Megawrecks | 8.0 | 61 |
| 9 | Thai Cave Rescue | 8.0 | 73 |
| 10 | London's Secret History | 7.7 | 67 |
| 11 | Secrets of Loch Ness | 7.7 | 76 |
| 12 | Hitler's Killer Warships | 7.8 | 58 |
| 13 | Lost Giants | 7.9 | 60 |
| 14 | Pacific Shockwave | 7.9 | 54 |
| 15 | Rise of the Roman Empire | 7.8 | 66 |
7.68 avg 10 episodes 7.1 → 7.6 47 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 0 | America's Last Slave Ship | 7.1 | 53 |
| 1 | The Atomic Ghost Fleet | 7.7 | 54 |
| 2 | The Viking Seas | 7.4 | 49 |
| 3 | Egypt's Sunken City | 8.0 | 57 |
| 4 | The Battle of Britain | 7.5 | 50 |
| 5 | Pirate Ships of the Caribbean | 7.8 | 46 |
| 6 | The American Revolution | 7.5 | 45 |
| 7 | Raiders of the Civil War | 8.0 | 38 |
| 8 | The Last Wrecks of WWII | 8.2 | 39 |
| 9 | Chicago | 7.6 | 45 |
7.68 avg 10 episodes 7.7 → 7.5 44 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | The Wild West | 7.7 | 39 |
| 2 | The Battle for the Black Swan | 7.6 | 40 |
| 3 | Arctic War | 7.6 | 21 |
| 4 | Hollywood | 7.5 | 36 |
| 5 | The First Americans | 8.1 | 33 |
| 6 | Venice's Lost Empire | 7.7 | 34 |
| 7 | The Mississippi River | 7.8 | 28 |
| 8 | Hurricane Apocalypse | 7.8 | 29 |
| 9 | The Great Barrier Reef | 7.5 | 27 |
| 10 | Sea of Secrets | 7.5 | 26 |
7.55 avg 6 episodes 8.0 → 7.8 44 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | The Secrets of Pompeii's Dead | 8.0 | 30 |
| 2 | The Amber Room | 7.2 | 31 |
| 3 | Pearl Harbor | 7.7 | 26 |
| 4 | The Alamo | 7.0 | 34 |
| 5 | Ancient Maya Resurrection | 7.6 | 25 |
| 6 | Narcos | 7.8 | 27 |
7.98 avg 6 episodes 7.5 → 7.9 44 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Alaska | 7.5 | 22 |
| 2 | Rise of the Mob | 8.0 | 29 |
| 3 | Secrets of the Dinosaurs | 8.3 | 29 |
| 4 | The Myth of the Pacific Pirate Ship | 8.2 | 24 |
| 5 | Invasion USA | 8.0 | 15 |
| 6 | $20 Million Time Bomb | 7.9 | 17 |
