Maybe I would ’cos I am nosey, it’s the entrance to the alum mine on Hummersea beach. However Chris Twigg tells us: ”Rather than a mine, it was connected by a shaft to the Alum House on the cliff top. Presumably to allow the transportation of goods in and out. The alum shale was actually been quarried on the cliff top to the west.”
Image courtesy of Julie Morrison, thanks to Chris Twigg for the update.
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