I was recently perusing Foxnews and found a couple of stories on waterboarding. This is one of those methods that have been used to to pry the truth out of uncooperative prisoners. It represent a gray area that may or may not be defined as torture, and was frequently mentioned during the past discussions in the news about the treatment of prisoners.
Waterboarding certainly is a terrible and unpleasant experience, but does not necessarily result in physical harm. There are two videos up at at Foxnews. The link below is for the first and then there is a related link to the second that appears when you are watching the first.