The crews had no prior access to the tunnel’s external portal face, approximately 170m vertically below the main access tunnel entry portal, so the entire tunnel was supported, drilled, and blasted from the inside to out.
The team says the complex method demanded precision, planning, and serious teamwork.
The breakthrough marks a major milestone in Genex Power project that will deliver up to 250MW energy.
The tailrace tunnels are the final sections of tunnelling, paving the way for renewable energy facility to take shape.
The project in Queensland involves the conversion of a disused gold mine into a pumped storage hydroelectric power generation facility.
