Gary McKinnon, the U.K. citizen accused of breaking into and damaging NASA's computers, <A HREF="http://news.zdnet.com/2100-1009_22-6159378.html?tag=nl.r23660">has begun an appeal</A> against extradition to the U.S. Edmund Lawson, who is defending McKinnon, told a hearing at London's High Court that McKinnon faced up to 60 years' imprisonment if he was convicted in the U.S., where he could be tried under its anti-terrorism legislation.