Last year Kate Bush released a live album called Before The Dawn. As part of its release, she made this music video for the live version of the song And Dream Of Sheep, which was originally released back in 1985 on her album Hounds Of Love.
This time the description on the YouTube video does my job for me:
“This is a special piece of film to accompany the release of the live single ‘And Dream Of Sheep’. The vocal was performed live while filming Kate lying in the huge water tank at Pinewood Studios. This was to create a sense of realism, as the character in the song is lost at sea. However it became more realistic than Kate had imagined. She spent so long in the water during the first day of filming that she contracted mild hypothermia. She recovered after a day off and carried on filming. Everyone agreed it had added to the authenticity of the performance. This film was then projected onto a large oval screen which hung above the stage during the performances of her live show.”