NASA hacker Gary McKinnon is launching another legal battle in a bid to avoid extradition to the US.
In 2001, McKinnon broke into US military computers, including those belonging to NASA, in what he claims was a bid to prove the US government had knowledge of UFOs.
While he says his actions caused no damage, the US claims he stole 950 passwords, deleted files at a naval base in New Jersey and rendered the military computer networks implemented after September 11 useless. The US estimates the damage caused by McKinnon at $700,000 (£433,000).
In August last year, the European Court of Human Rights agreed to allow McKinnon to be extradited to the US. In a bid to avoid extradition McKinnon told the Crown Prosecution Service he would plead guilty if tried in the UK.
But in February, the CPS refused to bring charges against him, leaving the matter to the US authorities which want to prosecute him themselves.
A judicial review of the original decision to extradite McKinnon, who suffers from Asperger's Syndrome, will take place this week. McKinnon's lawyers are expected to argue that he will be at risk of psychosis or suicide if he is removed from the UK.
In April, supporters of McKinnon gathered at the US embassy in London in protest at his potential extradition.