The idea came up after she was photographed in a buoyancy aid for the promotional material, a concept inspired by her piece The Ninth Wave from 1985.

She recently said: "It's about a woman who's lost at sea, but is rescued in the end. Months ago I thought that, as part of the show centres around the musical piece, it would hopefully make a dramatic shot."

Bush then decided to take it further by filming scenes that show her being rescued by a helicopter. A source tells the Mirror: "Kate wants the show to be out of this world - so she hired an underwater stage which is fitted with a wave machine and special lighting." - more.

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