They thought they were invincible. Starting in 2010 and lasting for two years, Chinese authorities dismantled the CIA’s network of assets in their country. Some sources fled, while others were given large sums of cash and left behind. But no one detained by Chinese intelligence survived. Now it’s thought that China was able to crack into the CIA’s online communication system. Agents in China have reportedly reverted to older methods of spycraft like meeting in person, with some intelligence experts wondering if internet-based systems can ever be counted on again.