Question: What year was the prison holding one of the two arrestees in the 18 September 2014 counter-terrorism raid opened?
Related documents: [0]  [DOC] The High Risk Management Centre (commonly called the SuperMax) was opened in September 2001. This was the first such facility in Australia and makes the Centre the highest security prison in Australia. [END] 
[1]  [DOC] On the morning of 18 September 2014, police in Australia carried out the biggest counter-terrorism operation in the nation's history, with over 800 heavily armed officers targeting households in the cities of Sydney and Brisbane. It came days after the Australian government raised the terror threat from medium to high due to concerns about Australian citizens returning to the country after fighting with the Islamic State of Iraq and the Levant (ISIL). Following the raids, two people were charged, one with terrorism offences and the other for possession of an unauthorised firearm.. One of the two arrestees became one of only two men on remand at the highest security prison in Australia, as he is considered an "AA" security risk. [END] 
Answer: 
2001
2001