In this procedure, the individual is bound securely to an inclined bench, which is approximately four feet by seven feet. The individual's feet are generally elevated. A cloth is placed over the forehead and eyes. Water is then applied to the cloth in a controlled manner. As this is done, the cloth is lowered until it covers both the nose and mouth. Once the cloth is saturated and completely covers the mouth and nose, air flow is slightly restricted for 20 to 40 seconds due to the presence of the cloth... During those 20 to 40 seconds, water is continuously applied from a height of twelve to twenty-four inches. After this period, the cloth is lifted, and the individual is allowed to breathe unimpeded for three or four full breaths... The procedure may then be repeated.
Historically in the West, the technique is known to have been used in the Spanish Inquisition. The suffocation of bound prisoners with water has been favored because, unlike most other torture techniques, it produces no marks on the body