For the past fortnight, divers have been scouring the ocean floor 450 kilometres off the Queensland coast for the wreck of the Royal Charlotte.
The Australian National Maritime Museum organised the expedition.
The Royal Charlotte, a convict and troop transporter, was en route to India with a contingent of troops when it sank in a gale on Frederick Reef in 1825.
Survivors spent six weeks on a sand cay until they were rescued by a government brig.
Among the wreck's remains the divers found timber, an anchor, a cannon and other items.