| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S01E01 | Underground Cities and Secret Chambers |
April 27, 2026
Hulu
|
44 | |
| S01E02 | Crystal Cathedrals and Buried Bunkers |
April 27, 2026
Hulu
|
44 | |
| S01E03 | Hidden Hypogeum and Lost Letters |
April 27, 2026
Hulu
|
44 | |
| S01E04 | Tunnels and Tombs |
April 27, 2026
Hulu
|
44 | |
| S01E05 | Labyrinths and Legends |
April 27, 2026
Hulu
|
44 | |
| S01E06 | Subterranean Secrets and Forgotten Foundations |
April 27, 2026
Hulu
|
44 | |
| S01E07 | Buried Battleship and Viking Victims |
April 27, 2026
Hulu
|
44 | |
| S01E08 | Bones Beneath and Coffins & Coins |
April 27, 2026
Hulu
|
44 | |
| S01E09 | Subterranean Seoul and Railway Revealed |
April 27, 2026
Hulu
|
44 | |
| S01E10 |
Secret School and Concealed Castle Cemetery
season finale
|
April 27, 2026
Hulu
|
44 |
No artwork of this type.
No artwork of this type.