Chinese hackers spent 5 years in US infrastructure, ready to attack
https://www.nbcnews.com/news/amp/rcna137706PRC State-Sponsored Actors Compromise and Maintain Persistent Access to U.S. Critical Infrastructure
https://www.documentcloud.org/documents/24412395-aa24-038a-csa-prc-state-sponsored-actors-compromise-us-critical-infrastructure