Internet security firm Mandiant, which was hired by the Times to trace the attack, followed the hackers' movements for four months, to try to establish a pattern and block them.
The research began to establish a clear pattern of stress-induced craving for drugs -- both for those early in recovery and those who were actively using.
But he believes more cores are needed from different regions, and is proposing to drill in other parts of the Arctic, notably areas north of Russia and east Asia, to establish the global pattern.