The Telegraph quoted photographer Phoebe Rudomino, as saying about Knightley: "She was naturally very good. She was wearing a fairly heavy dress which made it hard but she was surrounded by safety divers and she did very well."
The 24-year-old beauty was shooting to promote the charity Fresh2o, which provides clean water to people. Knightley said: "There may be gaffer tape holding a bikini together or divers hanging upside down to keep someone in a certain position but the viewer will only ever see the final polished shot."
The photos will now be showcased in a forthcoming exhibition called Water on the Lens, in London in October.
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