“he backbone of America — banks, oil and gas suppliers, the energy grid — is under constant attack by hackers. But the biggest cyberattacks, the ones that can blow up chemical tanks and burst dams, are kept secret by a law that shields U.S. corporations. They’re kept in the dark forever.
You could live near — or work at — a major facility that has been hacked repeatedly and investigated by the federal government. But you’d never know.”
Source: CNN investigates: How Corporate America keeps huge hacks secret – Nov. 30, 2015