Appeal for witnesses after woman killed in Sydney Airport tunnel crash
Wreckage from the head-on crash that is blocking the Sydney Airport Tunnel. (Nine)
Police are appealing for witnesses as they attempt to establish what caused a Ford Falcon to plough head-on into another car in the Sydney Airport tunnel this morning, killing one person and critically injuring another.
Four women were travelling to work in a Honda CRV on General Holmes Drive in Mascot when police say the Ford Falcon veered into the contraflow lane set up for peak hour, colliding with the Honda.
An off-duty nurse and police officer performed CPR until paramedics arrived.
Emergency services were called to the crash site at about 5.40am, where one of the Honda's rear passengers was found already deceased.
The three other female occupants were taken to hospital, where they remain in a stable condition.
The driver of the Ford Falcon is fighting for life in St George Hospital as he undergoes surgery for his injuries this afternoon.
"We're looking for the reasons why the Ford went from the southbound lanes into the northbound lane and collided with the other vehicle," Assistant Commissioner Michael Corboy said.
"The driver, subject to his condition, will be subject to all the normal tests. The driver is still in hospital at the moment so we'll speak to him when he recovers."
CCTV from inside the tunnel will also be examined as part of the investigation.
The crash closed down the airport tunnel during peak hour today, causing extensive delays for motorists in both directions.
The tunnel was reopened at 10.30am after emergency services and police investigators cleared the site, with four lanes available in each direction but traffic remained extremely heavy into the afternoon.
Anyone with dashcam vision or information is urged to contact Crime Stoppers on 1800 333 000.