A man, 61, has been injured at a work site at Garema Circuit, Kingsgrove.
The man tripped and fell over while working underground on the floor of a tunnel at about 10am this morning.
An ambulance spokesman said the operation to retrieve the man was a tricky excavation.
Paramedics treated him for neck pain at the scene and he was taken to St George Hospital with minor injuries in a stable condition.
He was released later that afternoon.
A spokeswoman for Westconnex Media Motorways says safety is its first priority and an investigation will be carried out into the incident as part of standard safety procedure.
Safework NSW was also notified.