John Sweeney next to barbed wire fence
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BBC Panorama team report undercover from North Korea

15 April 2013 Last updated at 23:41 BST

North Korea has marked the birth of its founder Kim Il-sung with a day of celebrations, despite the worldwide controversy about its nuclear weapons programme.

But the harsh reality of life in the secretive state has been recorded by a BBC team filming undercover with a group of university students on an official tour.

This report is by John Sweeney and the BBC Panorama team.