Late in World War II, the Nazis launched a bold plan to shelter armaments factories from allied bombs by building a labyrinth of protective caves. A small fortune was spent to seal them up, making them inaccessible to intruders. Sixty years later, the two-part series provides a glimpse into awesome worlds beneath the earth that still exist in Germany, France, Poland and Norway.
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | 0 | ||
| Season 1 | May 2004 | 2 | |
| Unassigned Episodes | 0 |
| Season | From | To | Episodes |
|---|---|---|---|
| Unassigned Episodes | 2 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | May 2004 | 2 | |
| Unassigned Episodes | 0 |
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