| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | The Wild West |
August 2, 2021
National Geographic
|
45 | |
| S04E02 | The Battle for the Black Swan |
August 2, 2021
National Geographic
|
45 | |
| S04E03 | Arctic War |
August 2, 2021
National Geographic
|
45 | |
| S04E04 | Hollywood |
August 9, 2021
National Geographic
|
45 | |
| S04E05 | The First Americans |
August 9, 2021
National Geographic
|
45 | |
| S04E06 | Venice's Lost Empire |
August 9, 2021
National Geographic
|
45 | |
| S04E07 | The Mississippi River |
August 16, 2021
National Geographic
|
45 | |
| S04E08 | Hurricane Apocalypse |
August 16, 2021
National Geographic
|
45 | |
| S04E09 | The Great Barrier Reef |
August 23, 2021
National Geographic
|
44 | |
| S04E10 |
Sea of Secrets
season finale
|
August 23, 2021
National Geographic
|
44 |
No artwork of this type.
No artwork of this type.
No artwork of this type.