INTERNEES known as the 'hooded men' have claimed new evidence exists that proves they were tortured in the north by the British government.
The men hope the evidence, which was found in the Public records office in London, could overturn a ruling by the European Court of Human rights that they had been subjected to inhumane and degrading treatment but not torture.
The men were arrested in 1971 and taken to a secret location where they were subjected to what was called 'deep interrogation'.
They were hooded and thrown from helicopters, believing they were hundreds of feet in the air when in actual fact they were hovering close to the ground.
The security force's 'five techniques' also included bombarding them with white noise, depriving them of food and sleep and forcing them to stand in stress positions with arms raised against a wall for prolonged periods.
In recent years it has been confirmed that the location was Ballykelly army base in Co Derry.
The Ministry of Defence has rejected allegations it used torture.
Lawyers for the 'hooded men' have passed the new information to the republic's attorney-general and believe it shows the British government withheld information from those investigating the original complaint to the European Court of Human rights and that they had been subjected to pre-meditated torture.