Two women drowned near Sydney's coast in Kurnell after being swept off rocks.

Despite emergency services' efforts, the women could not be revived.

A third woman managed to climb back onto the rocks with help from bystanders.

This incident is the second drowning at Kurnell in less than two weeks.

Kurnell is known for its high-risk rock-fishing conditions.

Police are investigating the incident, but no foul play is suspected.

The victims have not been formally identified.