The construction timeframe for Perth’s new $1.8 billion airport tunnel has been delayed by one year after a water leak temporarily halted the project.
The leak, which was identified in September, caused the tunnel under Dundas Road in Forrestfield to flood and created a sinkhole above the tunnel.
The project is designed to extend the rail line to the airport as part of the Metronet public transport masterplan.
It was due to start operating in the second half of 2020 but now will not open until the second half of 2021.
Transport Minister Rita Saffioti said the sinkhole was one of several reasons for the delay.
She said the water leak responsible for causing the sinkhole had damaged a 26-metre section of one of the tunnels, which now needed to be repaired before work could continue.
Ms Saffioti said there would be no blowout of the project’s budget as a result, because the damage would be covered by insurance.
But she admitted it was a very complicated project.