Series on exposing the secret tunnels, caves, railroads, and networks of the underground. From war to crime, fame and insane - the History Channel seeks to uncover all as we explore Secret Passages.
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | 0 | ||
| Season 1 | June 2001 | June 2002 | 6 |
| Unassigned Episodes | 0 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | 0 | ||
| Unassigned Episodes | 6 |
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