When did Horizon Season 8 Episode 31 air?
Horizon Season 8 Episode 31 aired on December 20, 1971.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 8 · Episode 31
The Periscope War
Dec 20, 1971·1h
Horizon presents the history of the submarines, from pre-World War I to today's nuclear powered submarines.
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How long is Horizon Season 8 Episode 31?
This episode runs for approximately 60 minutes.
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