David Irving often repeated the phrase ‘no holes, no holocaust’ when referring to the difficulty, since resolved, of finding remnants of an opening in the pulverised roof of one of the Auschwitz gas chambers through which Zyklon B canisters were introduced into the room. 1 This technique, which is sometimes more of a neurosis, is also used by climate damage deniers and other conspiracists. Here the detail is designed to derail.