Giant Tunnel Machine Completes 6km Snowy 2.0 Journey

Deep beneath the Snowy Mountains, a 2,300-tonne tunnel boring machine named Lady Eileen Hudson just completed an incredible underground journey that brings Australia closer to a renewable energy future.

The massive machine successfully broke through into Snowy 2.0's underground cavern complex after excavating a 6-kilometer tailrace tunnel. This tunnel will connect the project's underground power station to Talbingo Dam, the lower reservoir that makes the whole system work.

Lady Eileen Hudson has actually completed two tunnels for the project. She first carved out a 2.85-kilometer access tunnel before tackling the longer tailrace route, proving her worth in some of Australia's most challenging underground terrain.

"There's nothing more exciting on a tunnelling project than a breakthrough," said Snowy Hydro CEO Dennis Barnes. The geology under the Snowy Mountains is extremely tough, making crews work hard for every meter of progress.

The project brings the pioneering spirit of the original Snowy Scheme into the modern era. Snowy 2.0 will be a pumped-hydro battery that stores energy by moving water between two reservoirs, releasing it through turbines when the grid needs power.

The Ripple Effect

The momentum underground is building fast. Another tunnel boring machine called Florence is halfway through her 15-kilometer journey and consistently breaking her own records. A fourth machine named Monica just started work, tackling a particularly complex geological zone called the Long Plain Fault.

The engineering expertise on display extends far beyond this single project. Webuild, part of the joint venture delivering Snowy 2.0, was recently named to TIME100's Most Influential Companies of 2026 as a Pioneer shaping the future of infrastructure.

The company has operated more than 200 tunnel boring machines worldwide, excavating over 1,500 kilometers of tunnels. That's enough to stretch from Melbourne to Brisbane, all carved through solid rock underground.

Across Australia, these same teams and machines are building metro systems in Melbourne and transforming how people move through cities. The skills developed boring through the Snowy Mountains will help deliver the infrastructure Australia needs for decades to come.

Every meter of tunnel represents progress toward a cleaner energy future, dug by determined crews working in one of the most challenging environments on Earth.