What They Found review – Sam Mendes’s debut documentary has the power to change viewers for ever

This tale of two British army sergeants who filmed the liberation of the Bergen-Belsen concentration camp uses their profoundly disturbing footage. It’s TV that could alter your whole world viewWhat They Found, the first documentary by the film and theatre director Sam Mendes, is a short, stark shock. The film straightforwardly combines two precious artefacts held at the Imperial War Museum in London: 35mm film, shot by Sgt Mike Lewis and Sgt Bill Lawrie of the British Army Film and Photog