Ancient Alderney Figure 4 Ground Penetrating Radar results from the Roman fort called the Nunnery. Depth 2m clearly shows the buried remains of a central tower Published 21 November 2013 at 2232 × 1678 in The Nunnery ← Previous Next → Ground Penetrating Radar results from the Roman fort called the Nunnery. Depth 2m clearly shows the buried remains of a central tower