 Traces of the colonial defences remain from the establishment of Fort Bastion here in 1886.Initially the Battery defending the Harbour entrance had two 'disappearing guns', supplemented by two 6 pounders, with a magazine linked to covered passages and a search light mounted on Bastion Rock.At sea level, the submarine mining depot was set up at Biddick's Bay, opposite its northern equivalent across the Harbour at Torpedo Bay.