The route for the Forrestfield-Airport Link includes 8km of twin-bored tunnels, with safe entry and exit points via underground stations at Redcliffe and Airport Central, as well as tunnel portals at Bayswater and Forrestfield.
Given the length of the tunnels, additional infrastructure is required between the stations to allow safe egress to the ground level in the event of an emergency, and access to the tunnels for maintenance.
As such, three emergency egress shafts (EES), twelve tunnel-to-tunnel cross passages and three tunnel-to-egress shaft cross passages will be constructed along the alignment.
View the cross passage and emergency egress shaft construction fact sheet.
View a map of all cross passage and emergency egress shaft locations.
Emergency Egress Shafts
What is an emergency egress shaft?
An EES provides access from the tunnels to ground level via stairs and lifts.
Its layout is designed in conjunction with the Department of Fire and Emergency Services to ensure functionality during an emergency situation.
It takes up to six months to build each EES and another six months to build the supporting ground level infrastructure (a two-storey portal building, car park and emergency muster point).
The portal buildings house communications, electrical and mechanical equipment and controls. They also contain air vents which will help ventilate the shafts and tunnels.
All three emergency egress shafts (EES) are fully excavated, and
the respective base slabs have been poured.
Nine flights of stairs were recently assembled outside the
Abernerthy Emergency Egress Shaft (EES) and then craned into the shaft in two
sections. The stairs reach a height of 21.5 metres. Abernethy ESS is the first
of three shafts to be fitted out with stairs and a lift.
At Airport West EES, excavation has been completed to connect the
shaft to the two tunnels. This site is now being used to run ground freezing
pipes from the cooling towers to the airside cross passages via Tunnel One.
the 39m-deep emergency egress shaft at Wright Crescent, the erection of
tilt-up panels for the shaft building is underway.
What is a cross passage?
A cross passage is a short concrete tunnel which provides a link between two main tunnels, or a link between a tunnel and an EES. It takes up to three months to build each cross passage, which are up to 10 metres long and five metres high (around three metres high after final lining installation).
Of the 12 tunnel-to-tunnel cross passage located along the alignment, three have now been completed.
Crews are currently working at Cross Passage Car Park C, with excavation complete and installation of waterproof membranes ongoing.
Preparation works for the construction of the three cross passages located within the airside environment is ongoing.