Under the Migration Act 1958, it is mandatory for any non-citizen in Australia without a valid visa to be detained, whether they arrive on the mainland or on an 'excised offshore place'. These people – called ‘unlawful non-citizens’ under the Migration Act – may only be released from immigration detention if they are granted a visa or removed from Australia. Any asylum seeker who has arrived in an 'excised offshore place' by boat from 13 August 2012 onwards is potentially liable to transfer to a third country for processing of their claim for protection. Some of these asylum seekers have been transferred to Nauru and Manus Island in Papua New Guinea where they are in immigration detention. A large number of people who arrived in Australia from 13 August 2012 onwards remain in immigration detention in Australia. Some have been released on bridging visas.
There is a well-established link between prolonged indefinite detention and serious mental health issues. Uncertainty about their future, lack of independence and loss of control over their lives, the monotony of life in detention, concern about family members still living in dangerous situations overseas, the impacts of past torture and trauma and witnessing the negative impacts of detention on other detainees all contribute to