Continue South alone the Gloucester walk. When you get to the two sets of stairs, climb the ones going up, which are on the right, onto Cumberland street. Cross the road and look down at the tunnel. This is the Argyle Cut.
The argyle cut is an underground tunnel that was carved out from the sandstone by convicts. It was made in the years 1843-1867 by carving out the sandstone. The first part was done by convicts with hammers and chisels, but finished with explosives as well.