Submarines can detect it underwater. Fighter pilots feel it shake their aircraft. This Soviet turboprop engine broke every rule of aviation—becoming the loudest aircraft powerplant ever built. Discover why the USSR created a machine so powerful its propeller tips go supersonic, how it powers the legendary Tu-95 Bear bomber, and why this 70-year-old Cold War relic still flies combat missions today. The story of raw engineering power that refused to be quiet.