Movie where woman is kidnapped and kept in a hole

After a catastrophic car crash, a young woman wakes up in a survivalist's underground bunker, where he claims to have saved her from an apocalyptic attack that has left the outside world uninhabitable.

This extraordinary interview reveals the ordeal of Nat­­ascha Kampusch, imprisoned in a cellar for eight years by Wolfgang Priklopil.

A small girl is found dead in a deserted underground cellar. She has been dead for some time but there is fresh food for her. Who is she?