For the first 23 years of his life, Shin Dong-hyuk had no idea what life was like outside his prison walls.

Shin was born and raised in a North Korean prison and is believed to be the only person who has escaped and lived to talk about it.

In a lengthy interview with 60 Minutes, Shin goes into great detail about what life was like as a North Korean prisoner. He also talks about his harrowing escape and journey to freedom.