26 Port Arthur the site of the secondary punishment penitentiary opened in 1830. "Writer's Block Writing Tips Plural and Possessive Abbreviations". Later that year, a convict built brick wall was added which featured internal fireplaces that heated the wall in order to allow exotic tropical plants to grow along its length. Demobilisation following the Napoleonic Wars had left thousands of veterans unemployed, and many turned to crime, resulting in an increasing number of transported felons. 24 Hobart in 1832 The opening of penal settlements at Maria Island (1825) and Port Arthur (1832) on the Tasman Peninsula, 111 km Southeast of Hobart Town, brought more importance to the island's East Coast, which resulted in the closing of Sarah Island penitentiary in 1833.