Sunday November 25 2007 08:01 IST EXPRESS NEWS SERVICE BANGALORE: A recent scientific research using archeo-astronomy tools has sought to prove that Ramar Sethu is not natural but a man-made sea ridge. It’s a testimony to the civil engineering marvel of an ancient civilisation, that stands even today as a man-made accretion over a natural formation in the sea. DK Hari, conceptualiser of Bharath Gyan, a NGO which is in to collating specific, scientific knowledge of India has, at a presentation on ‘Historical Rama’ here on Saturday, said the records compiled together talk about Ramar Sethu’s usage until 1480. But it went into disrepair after a debilitating cyclone in 1480, he pointed out. Hari said Rama indeed was a historical hero and lived nearly 7200 years ago. To rescue Sita from the clutches of Ravana, Lord Rama and his team built the bridge. With the help of Nala as the architect, he designed and executed the project along with the help of ‘Vanara’ tribe. So