The trust said it was one of a number of "innovative, nature-based solutions to protect Northey Island against rising sea levels and the rapid loss of saltmarsh".
"It's producing fragments of building stone, so it might be structural. We might be thinking of a small shrine or a chapel," says Dr Andy Seaman, from Cardiff University, who is leading the dig.
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Олеся Мицкевич (Редактор отдела «Силовые структуры»)
Фото: Борис Ельшин / РИА Новости