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A manned un-powered 'rotor kite' that was towed behind a surfaced U-Boat to a height of nearly 400ft to enable them to sight shipping at a distance greater than would be achievable when on the surface or at periscope depth.
This photo is copyright © Kev Slade, and may not be used or published in any way without permission.
It was added on 11 April 2022, and has since been viewed 148 times.