Ross Kemp was left stunned during his Barlinnie Prison documentary after it was revealed one con tried to smuggle a SIX INCH knife into the jail by hiding it up his bum.

The 53-year-old was left in disbelief when guards showed him the lengths that inmates will go to to bring contraband into the prison.

READ MORE: Ross Kemp in Barlinnie: Viewers horrified as paedo says ‘kids enjoy’ sexual abuse in documentary

The ex-EastEnders star was shown a range of weapons, drugs and mobile phones lags try to hide internally 

Kemp said: "You are kidding me?

"Look at the length of it. Look at the point on it."

Another inmate even tried to 'bank' FIVE mobile phones in his bum.

Kemp tweeted: “They found a guy with five phones banked inside him.

“Lucky the answer machine wasn’t on.”

During the programme on Scotland's most notorious jail Ross Kemp was also left sickened when one paedophile he interviewed claimed children 'enjoy' being sexually abused.

The paedophile further left viewers open-mouthed when he said he believed he should be released - because he “didn’t see what harm [I] would do on the outside.”

READ MORE: Ross Kemp in Barlinnie: Viewers horrified as paedo says ‘kids enjoy’ sexual abuse in documentary

With unprecedented access, Kemp immersed himself in prison life at the sharp end in the iconic jail which has a formidable reputation, having served the city for over 130 years.