British hostage Peter Moore has described being beaten, shackled and subjected to mock executions.
Speaking publicly for the first time since his release, Mr Moore said even as he was told he was going to be released he suspected he was about to be killed.
He said over the three years conditions improved, so that while in 2007 he was chained, blindfolded and beaten, by 2009 he was given access to a PlayStation and satellite television.
Mr Moore was released on December 30, 946 days after he was kidnapped in Iraq.
The 36-year-old computer expert, from Lincoln, was seized along with his four British bodyguards by militants posing as police at the Iraqi finance ministry in May 2007.
The bodies of three of Mr Moore's bodyguards - Alec MacLachlan, 30, from Llanelli, South Wales, Jason Swindlehurst, 38, from Skelmersdale, Lancashire, and Jason Creswell, 39, originally from Glasgow - were passed to UK authorities last year.
A fourth bodyguard, Alan McMenemy, 34, from Glasgow, is also believed to have been killed.
Mr Moore paid tribute to his fellow hostages and called for the return of Mr McMenemy's body.
Speaking to Channel 4 News he said: "I'm very grateful to Jason, Jason, Alec and Alan for the help and advice and the medical treatment I received following my abduction.
"Certainly without that help and advice I definitely wouldn't be stood here today."