Deeper in the maze-like layout is a windowless detention center, its walls covered in dingy granite tile and smelling of mildew.

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Materials include granite and porcelain tile, mahogany paneling on the walls and chandeliers in the two attached bathrooms.

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Hawkins paces out just one square foot of foreshore and picks up Victorian plate, modern glass, oyster shell, medieval roof tile, granite ballast from merchant ships and clay pipe stems.

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