When did Horizon Season 15 Episode 21 air?
Horizon Season 15 Episode 21 aired on November 10, 1978.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 15 · Episode 21
Divers Do It Deeper
Nov 10, 1978·1h
Horizon explores the years of research that have enabled divers to go to greater and greater ocean depth.
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Direct answers for episode-level questions and details.
How long is Horizon Season 15 Episode 21?
This episode runs for approximately 60 minutes.
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