"They weren't just pouring water over their heads or over a cloth," said the source who has first-hand knowledge of the period. "They were holding them under water until the point of death, with a doctor present to make sure they did not go too far. This was real torture." The account of extreme CIA interrogation comes as the US Senate prepares to publish a declassified version of its so-called Torture Report – a 3,600-page report document based on a review of several million classified CIA documents."