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.
Maritime archaeologist Kieran Hosty says the shipwreck will offer great insights on convict and troop transportation in the 19th century.
Story: ABC | Photo: Wikimedia Commons