<br/> China has started construction of the world's highest altitude gravitational wave telescopes in a Tibet prefecture close to Line of Actual Control with India. The telescope when built, will detect faintest echoes resonating from Universe which may shed some light about the Big Bang theory. <br/><br/>The construction of the first telescope, code-named Ngari No 1 has begun 30 km south of Shiquanhe Town in Ngari Prefecture. The observatory is expected to be finished in five years.