Nuclear subs may be tracked

Russian and Chinese scientists appear to be on the verge of perfecting systems to track nuclear submarines -which radically reduces their military value. Nuclear submarines are usually massive, with the largest around 200 metres long and displacing 50,000 cubic metres of water. When they cruise underwater they create gravitational ripples. A sensitive detector has been developed to analyse the invisible ripples, allowing the submarine to be tracked, targetted and destroyed. Emissions from submarine nuclear reactors are also able to be detected, providing clear identification of individual vessels.