Analysis of information sources in references of the Wikipedia article "Waterboarding" in Danish language version.
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After immobilizing a prisoner by strapping him down, interrogators then tilted the gurney to a 10-15 degree downward angle, with the detainee's head at the lower end. They put a black cloth over his face and poured water, or saline, from a height of 6 to 18 inches, documents show. The slant of the gurney helped drive the water more directly into the prisoner's nose and mouth.