These pix were taken on July 28 2012 along the O'Shannassy Aqueduct Trail, East Warburton, 70 km east of Melbourne.

My exploration was a 4 km return hike along a sector of the 27 km trail between the Yuonga Rd entry point and the underground tunnel.

The tunnel passes through the side of Mt Victoria, at a point where it was not possible to build an open channel. ... (more)