When did Horizon Season 12 Episode 21 air?
Horizon Season 12 Episode 21 aired on July 21, 1975.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 12 · Episode 21
The Sickly Sea
Jul 21, 1975·1h
This episode of Horizon describes the various aspects of the pollution problem of the Mediterranean Sea.
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Direct answers for episode-level questions and details.
How long is Horizon Season 12 Episode 21?
This episode runs for approximately 60 minutes.
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