return now to the shocking case of mark defriest. in 1970 nine, his father died and left him a set of tools. mark picked his tools up before they were probated. he was arrested for stealing. at the age of 19, mark was sentenced to four years in prison in florida. it is now 34 years later and mark is still locked up. he spent 27 of those years in solitary confinement. even though he has never committed a violent act. his story is told in a shocking new film called "the life and , mind of mark defriest." the film looks at how mark ended up in jail and how he became known as the houdini of floor to prisons because tried to escape 13 times -- seven of them successfully. about a month into a sentence, he tried his first escape. this is a clip of mark defriest describing that attempt. >> there was a bible study. supposed to be escorted around the compound at night. many of us broke camp. >> that's a excerpt from "the life and mind of mark defriest." in another escape attempt, mark used a "zip gun" he made in wood shop class. he said he nev