One of the most intriguing secrets of Operation Epic Fury is how, using an "exquisite" piece of classified technology, the CIA succeeded in finding the injured airman in Iran by detecting his heartbeat, the tiniest evidence of human life concealed in a narrow crevice up a 7,000ft mountain ridge. The technology that led to the airman's rescue by Seal Team Six commandos has been outed as a CIA "tool" called Ghost Murmur. It was reportedly developed as a highly classified "blue skies" invention by Lockheed Martin's Skunk Works, the famous laboratory where young, brilliant scientists and engineers devote their time to finding solutions to impossible concepts. John Ratcliffe, the CIA director, hinted at the new technology in a press conference this week. "We deployed both human assets and exquisite technologies that no other intelligence service in the world possess to a daunting challenge, comparable to hunting for a single grain of sand in the middle of a desert," Ratcliffe said. On the face of it, a futuristic magnetic sensing device ... pinpointed the missing colonel's heartbeat across a 40-mile stretch of land. Ghost Murmur, as described, would appear to push the boundaries of physics beyond even the most exceptional human brain or computer. Intelligence sources would not confirm or deny the existence of Ghost Murmur. But reportedly the "CIA tool" relies on what is called quantum magnetometry, which can find signals of human hearts, aided by artificial intelligence to separate out all the other noises getting in the way.