Plot: While mapping out the largest cave system in Ukraine, explorer and investigator Chris Nicola discovers evidence that five Jewish families spent nearly a year and a half in the pitch-black caves to escape the Nazis. This is the story of the longest uninterrupted underground survival in recorded human history.
Alternative Plot: In 1993, spelunker Christopher Nicola finds the cave in which a group of Ukrainian Jews spent more than 500 days hiding from Nazis during World War II.
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