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''I was actually experimenting on making a glider and a shield in order to protect myself at the same time,'' he told the court.

''A glider in order so I could fly from the rooftop over the wall of the prison establishment.''

He said when Mr Stringfellow saw him with the ''glider'', he feared he would be taken to the segregation unit and killed.

''I believed they was going to take me to the segregation and kill me,'' he said.

''I have heard rumours of them killing within the segregation at HMP Long Lartin, plus I believed that they was out to assassinate me as well.

''I thought, 'I need to get out of here'.''

Laurent Bonomo and Gabriel Ferez

Daniel Sonnex is serving a minimum of 40 years for torturing and stabbing to death Laurent Bonomo and Gabriel Ferez in June 2008.

Reading Crown Court has heard the 27-year-old jumped on Mr Stringfellow's back, holding a knife to his throat, shouting: ''I'm going to slit your f***ing throat.''

As he was restrained by other officers, Sonnex started shouting, foaming at the mouth and chanting in Arabic, the court has heard.

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Killer tried to build glider from fridge parts to escape prison