Macquarie Harbour Penal Station

The Macquarie Harbour Penal Station, a former British colonial penal settlement, established on Sarah Island, Macquarie Harbour, in the former colony of Van Diemen's Land, now Tasmania, operated between 1822 and 1833. The settlement housed male convicts, with a small number of women housed on a nearby island. During its 11 years of operation, the penal colony achieved a reputation as one of the harshest penal settlements in the Australian colonies. The formal penal station is located on the Sarah Island that now operates as an historic site under the direction of the Tasmania Parks and Wildlife Service.
Rationale for establishment.
The penal station was established as a place of banishment within the Australian colonies. It took the worst convicts, those who had reoffended and those who had escaped from other settlements. The isolated land was ideally suited for its purpose. It was separated from the mainland by the wide expanse of river, surrounded by a mountainous wilderness and was hundreds of miles away from the colony's other settled areas. The only seaward access was through a treacherous narrow channel known as Hells Gates.
Strong tidal currents resulted in the deaths of many convicts before they even reached the settlement owing to ships foundering in the narrow rocky channel. The surveyor who mapped Sarah Island concluded that the chances of escape were "next to impossible". Neighbouring Grummet Island, a small island to the Northeast, was used for solitary confinement.
Lieutenant-Governor William Sorell wanted the new penal colony to be economically viable. It could then reimburse the British government for the expense of its establishment. The island was cleared soon after the arrival of the convicts and their Governor. However, this exposed the settlement to the howling gales of the roaring forties, so it was necessary to build a wall from Huon Pine to provide shelter. 
Convicts spent most of their waking hours, often up to their necks in water, cutting timber and preparing it for rafting down the river. Lashings were common and were to be administered by another convict. If they were not administered with sufficient severity, the convict who had been given responsibility for administering the lashes was also lashed. The severity of the lashings was sufficient to cause death in some cases. If a convict appeared in danger of death, a doctor could intervene, the lashing would cease (for a time) and be resumed once the convict was deemed to have recovered sufficiently for it to continue. 
After a time, a Scottish shipbuilder David Hoy, who had heard of the remarkable properties of Huon Pine for shipbuilding came, voluntarily, to the island. He negotiated with the convicts, allowing them rations of rum and tobacco, and more weatherproof sleeping quarters in exchange for their cooperation. For a short period, it was the largest shipbuilding operation in the Australian colonies. Chained convicts had the task of cutting down Huon pine trees and rafting the logs down the river. 
Conditions.
As Sarah Island could not produce food, malnutrition, dysentery, and scurvy were often rampant among the convict population. The penal colony had to be supplied by sea. Living conditions were particularly bad in the early years of the settlement. The settlement was so crowded, convicts were unable to sleep on their backs in the communal barracks. Punishment involved solitary confinement and regular floggings - 9,100 lashes were given in 1823.
In 1824 a prisoner named Trenham stabbed another convict in order to be executed rather than face further imprisonment at Macquarie Harbour Penal Station.
It was finally closed in late 1833. Most of the remaining convicts were then relocated to Port Arthur.
Escapes.
Despite its isolated location, a considerable number of convicts attempted to escape from the island. Bushranger Matthew Brady was among a party that successfully escaped to Hobart in 1824 after tying up their overseer and seizing a boat. James Goodwin was pardoned after his 1828 escape and was subsequently employed to make official surveys of the wilderness he had passed through. Sarah Island's most infamous escapee was Alexander Pearce who managed to get away twice. On both occasions, he cannibalized his fellow escapees.
When the station was closing down, ten convicts were permitted to remain to complete building a brig. When it was complete, they sailed down the river toward the sea, put everyone else ashore and sailed the brig to Chile.
Later use and current conditions.
The island was later used for pining purposes, and was known by the piners as Settlement Island, rather than Sarah Island, though it has since reverted to its original name.
The ruins of the settlement remain today as the "Sarah Island Historic Site" —part of the larger Tasmanian Wilderness World Heritage Area—though they are not as well preserved as those at better-known Port Arthur. The island is accessible via ferries and charter boats operating out of the town of Strahan.
In the media.
Sarah Island has been frequently featured in Australian literature and theatre, often representing the worst excesses of the British convict system.
Notable books include: 
In Strahan, the main port and town on the shores of Macquarie Harbour today Australia's longest running play "The Ship that Never Was" by Tasmanian author Richard Davey dramatises the Frederick escape, the last escape from the island. His book "The Sarah Island Conspiracies - Being an account of twelve voyages to Macquarie Harbour and Sarah Island" furthers understanding of the history and the recent archaeological work on the island.
The films "The Last Confession of Alexander Pearce" and "Van Diemen's Land" deal with one of the more notorious escapees.
Photography of the island and ruins have at various stages shown the ruins of the buildings:
Known escapees.
3 September 1830 five men ran away from the settlement, Richard Hutchinson, William Coventry, Patrick Fagan, Mathew Macavoy, and Broughton, and that they were upwards of thirty days before the two 'survivors' surrendered themselves at Macguire's Marsh near Osterley.