I traced a 1st cousin 6 times removed who, in 1833, committed a crime of shop breaking with two others. The three of them were caught within days and imprisoned until their trial in February 1834. All three were found guilty and sentenced to transportation. In my distant cousin's case, transported for seven years. The three of them were taken back to the local prison until they were taken to a prison hulk on the River Thames. My distant cousin remained on the hulk until June 1835 when he started his journey to Van Diemen's Land (Tasmania). The transport ship arrived in Hobart, Tasmania in early October 1835. After being processed in the Penitentiary, he was put to work as a river boatman, utilising his previous UK work experience. With the assistance of the various archives 'down under', I was able to piece his storey together until the day he received his freedom and then he disappeared form all records. My thoughts on his disappearance were (1) he changed his name and relocated or (2) he changed his name and as he had boat skills, attained work on a ship sailing from Tasmania.
If the original poster wishes to try and find out what happened to his ancestor, I have listed below the archives that I used with a special 'shout out' for Michael Hosking of the Maritime Museum of Tasmania. (note: I carried out my research only 5 years ago so the list below should still be valid)
The National Library of Australia
The Tasmanian Archives of Australia
The Maritime Museum of Tasmania
The Victoria State Library of Australia
www.findmypast.co.uk/search/britishnewspaperswww.nationalarchives.gov.ukwww.ancestry.co.uk/search/collections/60920/The Ancestry link takes you to 'Tasmania, Australia, Convict Court and Selected Records, 1800-1899' -- I found several references here.