Forrestfield-Airport Link
Australia, Perth
2017 – 2020
Grace and Sandy are boring in Down Under

Since July and October 2017, "Grace" and "Sandy" have each been boring a 7.6 kilometer long section of the Forrestfield-Airport Link in Perth, Western Australia. The two Variable Density Tunnel Boring Machines (TBM, Ø 7,050 mm) built by Herrenknecht at its site in Guangzhou, China, successfully completed the interim breakthroughs to the future Airport Central station in May 2018. By fall 2018 the jobsite crews excavated around 3 kilometers of tunnels with each TBM, lining them with more than 20.000 segments. On their way from east to west, the two machines passed under both the operating Perth airport and the Swan River, up to 26 meters below the river bed.

The new subway will connect the eastern suburbs and the international airport to the city center with two parallel tubes. With three new stations (Redcliffe, Airport Central, Forrestfield) and the connection to the Midland Line near the station Bayswater, the Forrestfield-Airport Link will significantly enhance the public transport system in the Western Australian metropolis.

Forrestfield-Airport Link

Data Sheet

Country, Location

Australia, Perth


2017 – 2020




Heterogeneous ground

Tunnelling length

15,210 m

Machine Data

2x Multi-mode TBM:
Diameter: 7,050 mm
Lining method: Segmental lining
Cutterhead power: 1,400 kW

Your contact person Contact us

Steffen Dubé President and General Manager Herrenknecht Tunnelling Systems USA Inc.
Gerhard Goisser Commercial Manager Herrenknecht Tunnelling Systems USA, Inc.