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Three people, all in their 20s, were injured in the collapse.
Ambulance Victoria said a 28-year-old man has serious upper-body injuries.
He will be airlifted to a hospital in Melbourne.
A man and a woman sustained non-life-threatening injuries and were taken to hospital.
Victoria Police believe a cliff face upwards of 30 metres high gave way and collapsed on the group.
Six people were sitting under the cliff face when rocks fell and struck three of them.