Nasa's Unexplained Files
Mars's Deepest Secret
Season 4 Episode 8 of 8
An account of how a malfunction on the ISS threatens to poison the crew with a deadly gas, and a startling image taken by a Nasa probe points to evidence of life on Mars
Nasa's Unexplained Files airs on Discovery History at 1:00 PM, Tuesday 4 November. (Subtitles.)
Topics
Education ➝ Science ➝ Factual Topics
Unexplained ➝ Mysteries