Police continued their investigations throughout the day on Wednesday at a garden allotment just outside the German city of Hanover. The police are working as part of a search linked to the 2007 disappearance of Madeleine McCann in Portugal.
Evidence of bulldozers and the tracks of excavation vehicles could be seen in footage filmed at the allotments on Wednesday afternoon.
Reports indicate that a “cellar” was found on the allotment plot.
Though there have been few leads throughout the lengthy investigation into the British three year-old's disappearance, the case was revitalised in June when German authorities identified a new suspect, a 43 year-old German citizen currently serving a prison sentence in Kiel.
The man, known as Christian B., was last known to have lived in Braunschweig, roughly 70 kilometres (43.5 miles) away from Hanover.
Madeleine McCann went missing from an apartment complex in the Portuguese town of Praia da Luz while her parents ate dinner at a nearby tapas restaurant on May 3, 2007. Her twin siblings, who were in the room sleeping with her, were left in the room she was thought to have been kidnapped from.