NorthConnex Tunnel
Find out more


About 21 kilometres of tunnelling is being carried out for NorthConnex. The two main nine kilometre tunnels will carry motorists between the M1 Pacific Motorway and the Hills M2 Motorway and additional tunnels are being excavated for on and off ramps. 

The deepest part of the tunnel will be around 90 metres, passing under the Sydney Metro Northwest tunnel at Beecroft. More than half the tunnel is more than 60 metres deep – about the height of the Sydney Opera House. A map of the project alignment is available here.  

Tunnel progress

Tunnelling activities are supported from four main construction worksites: 
      1. Southern interchange      
      2. Wilson Road tunnel support facility     
      3. Trelawney Street tunnel support facility      
      4. Northern interchange  
These sites provide power supply, ventilation, water supply, construction water treatment plants, workforce facilities, spoil handling facilities and connections to existing roads. An interactive map shows tunnelling progress.

Will I be advised when tunnelling is near my home?

If your property is directly above the tunnel route, we will write to you approximately one month before we plan to tunnel in your area. An example of the letter can be found here. If you are unsure whether tunnelling is planned for directly below your property, please contact the project team on 1800 997 057.

Current notifications for upcoming tunnelling include:
Wilson Road
Hull Road Beecroft

How deep will the tunnel be beneath my home?

The tunnel is being excavated at various depths across the alignment and is shallower at the northern and southern ends where the tunnel surfaces to join the Hills M2 Motorway and M1 Pacific Motorway. To explore the tunnel depth near your home, please visit the tunnel depth map.

Project Activities

Construction updates