Construction workers excavating 12 metres underground for the M6 tunnel project at Rockdale were forced to evacuate yesterday after the ground began to collapse.
The sinkhole occurred at the face of the south-bound tunnel on the airport side of West Botany Street.
The workers were 12 metres underground and undertaking excavation work when it began to cave in.
They were immediately evacuated.
Transport for NSW said no one was injured.
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”No injuries occurred and a small work crew who were in the tunnel at the time, were evacuated as part of standard safety procedures,” a statement from the department said.
“SafeWork NSW was immediately notified and an exclusion zone has been established around a 20-square metre area.”
The area impacted is not accessible to the public and was away from residential and commercial buildings.
Further tunneling work has stopped while engineers and other experts assess the area.