Operation Crossbow: How 3D glasses helped defeat Hitler
Newly released photographs show how a team of World War II experts disrupted Nazi plans to bombard Britain - with the help of 3D glasses like those in modern cinemas.
Hitler's deadly V-1 and V-2 missiles were early but effective weapons of mass destruction - unmanned flying bombs which brought terror to southern England.
But their impact could have been all the more devastating - costing thousands more lives, lengthening the war and threatening the D-Day landings - were it not for the fact that British intelligence worked in three, rather than two, dimensions.
One of the Royal Air Force's most significant successes came with Operation Crossbow, when it tracked down, identified and destroyed many of the V-weapons which could have prolonged the war.
It did so by meticulously photographing the landscape of occupied Europe in a way that allowed officers to study every contour....
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