In brief, Britain had devised a system of torture, combining prolonged stress positions, subjection to white noise, sensory deprivation, and cessation of food, drink, and sleep. The Five Techniques could be applied to anyone in almost any context, cost little or nothing to employ, and would not leave physical marks on victims. As such, public exposure, scandal or prosecution for human rights abuses and/or war crimes was extremely unlikely, if not impossible.

Physical pain and psychological devastation inflicted by the Five Techniques was nonetheless dependably gargantuan. In stress positions, detainees were stripped, then forced to wear buttonless boiler suits and hoods, before being forced to stand with their legs spread apart, leaning forward with their arms held high against a wall, supporting all their weight with their fingers alone. Simultaneously, relentless white noise was pumped into their cells. If a prisoner did not maintain the stress position, they were beaten into compliance.

The Intelligence Corps report notes these methods had been applied over the past three decades to prisoners of war, refugees, guerrilla fighters, and spies.

https://kitklarenberg.substack.com/p/how-britain-invented-modern-torture?

 

According to this article, these “techniques” have been widely adopted by allied forces around the world.