Hunt for Aliens

1st April 2010 45 mins Season 7 Episode 6

Scientists reveal evidence of the existence of alien life. Detailed imaging of an underground ocean on a planetary moon and newly discovered extrasolar planets reveal what contacting alien life will be like. This is a serious scientific look at how will we meet ET.

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Season 7 · Episode 7

Expedition Apocalypse

The famous explosion that took place in Siberia early in the 20th century, known as the Tunguska Event, obliterated everything within thousands of square miles. It was so intense that the skies of Europe were lit for several nights. The debate continues over its cause: meteor, comet, or volcanic gasses?

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