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Strapped to explosives, threatened with execution and packed into a vehicle with a suicide bomber, civil engineer Nick feared for his life. It was 2013, and he had found himself at the heart of a violent attack on the Algerian gas facility he was working at, carried out by a group later revealed to be affiliated to Al-Qaeda. It was a deadly hostage situation, in which 39 workers lost their lives – several of them Nick’s close colleagues.

Talking to Dr Sian Williams, he describes how the attack unfolded and why he has sought to use his horrific experience to support others facing similar trauma.

Producer: Tom Alban

Warning: This episode contains descriptions of violence and death. Details of help and support are available through the ÃÛÑ¿´«Ã½ Action Line at bbc.co.uk/actionline.