http://smallwarsjournal.com/blog/2007/10/waterboarding-is-torture-perio/
by a guy who's done it to others and had it done to him, in his capacity as a Marine trainer, and has studied the history of this specific technique intensively. He gets up a surprising head of steam working purely within the idea of honor, which is the one moral code nobody can out-macho you on. And there are many interesting details that you could only know by being there.
Michael