A man detained multiple times said North Korean prisons have improved over the years because the last time he was jailed he no longer had to walk on all fours

• North Koreans who fled the country spoke to CNN about the conditions they faced in detention. 
• Those who spoke said they saw and experienced rapes, beating, and torture. 
• One expert told CNN that many released prisoners are unaware that they lived through torture.

In the North Korean penal system, prisoners face violent rape, starvation, and forced labor, but some don't even realize they are being tortured.