The Dunbar approached Port Jackson from the south on 20 August 1857 during heavy rain and a strong gale, wrecked near the harbour entrance, and left one survivor.

On the night of 20 August 1857, the ship approached the entrance to Port Jackson from the south, but heavy rain and a strong gale made navigating difficult. Captain James Green either erroneously believed he had passed the harbour's southern headland or mistook The Gap for the port's entrance, driving the ship onto rocks. The vessel was driven against the cliffs and rapidly broke apart; 59 crew and 63 passengers were aboard, and all drowned except Able Seaman James Johnson, who clung to the cliff face until rescued a day or two later. The wreck occurred near the entrance to Sydney Harbour, with the loss of 121 lives, and ranks as one of Australia's worst maritime disasters.

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