| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S02E01 | Secrets of D-Day |
June 3, 2019
National Geographic
|
60 | |
| S02E02 | Secrets of New York City |
June 10, 2019
National Geographic
|
60 | |
| S02E03 | Killer U-Boats |
June 17, 2019
National Geographic
|
60 | |
| S02E04 | Buried Secrets of the Gold Rush |
July 1, 2019
National Geographic
|
60 | |
| S02E05 | Secrets of the Civil War |
July 22, 2019
National Geographic
|
60 | |
| S02E06 | Lost Nukes of the Cold War |
July 29, 2019
National Geographic
|
60 | |
| S02E07 | Secrets of the Spanish Armada |
August 5, 2019
National Geographic
|
60 | |
| S02E08 | Pacific War Megawrecks |
August 12, 2019
National Geographic
|
60 | |
| S02E09 | Thai Cave Rescue |
September 2, 2019
National Geographic
|
60 | |
| S02E10 | London's Secret History |
September 9, 2019
National Geographic
|
60 | |
| S02E11 | Secrets of Loch Ness |
September 16, 2019
National Geographic
|
60 | |
| S02E12 | Hitler's Killer Warships |
September 23, 2019
National Geographic
|
60 | |
| S02E13 | Lost Giants |
September 30, 2019
National Geographic
|
60 | |
| S02E14 | Pacific Shockwave |
October 7, 2019
National Geographic
|
60 | |
| S02E15 |
Rise of the Roman Empire
season finale
|
October 14, 2019
National Geographic
|
60 |
No artwork of this type.
No artwork of this type.
No artwork of this type.