When did Horizon Season 9 Episode 1 air?
Horizon Season 9 Episode 1 aired on January 3, 1972.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
In this episode of Horizon, you find out how feasible it is to build a 35 mile long tunnel between Britain and France.
Direct answers for episode-level questions and details.
Horizon Season 9 Episode 1 aired on January 3, 1972.
This episode runs for approximately 60 minutes.
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