Chinese hackers are developing the &;quot;ability to physically wreak havoc on our critical infrastructure at a time of its choosing‚&;quot; FBI director Christopher Wray said this week. He added that the hackers are waiting &;quot;for just the right moment to deal a devastating blow.&;quot; The hacking campaign‚ known as Volt Typhoon‚ has embedded itself successfully in several American critical infrastructure companies that include telecommunications‚ energy and water‚ and others‚ he said.