When did Horizon Season 24 Episode 7 air?
Horizon Season 24 Episode 7 aired on February 16, 1987.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Report on exploration into releasing energy sources which came from outer space during the formation of the earth, 4,500 million years ago, and have lain dormant under the earth's crust. In Sweden a five mile deep drill hole was made to unleash this energy.
Direct answers for episode-level questions and details.
Horizon Season 24 Episode 7 aired on February 16, 1987.
This episode runs for approximately 60 minutes.
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