In the depths of Ukraine's largest cave system, explorer Chris Nicola uncovers a remarkable tale of survival as he discovers evidence of five Jewish families hiding from the Nazis in the dark caves for nearly 18 months, making it the longest recorded underground survival in human history.
No Place on Earth
In a Ukrainian cave, a hidden chapter of World War II is revealed, as a group of survivors takes refuge in the depths, their stories waiting to be uncovered.
