ST. MARK'S SQUARE, VENICE. Built on sinking islands in a lagoon, the city is losing ground to damaging flooding.Image: FABIO GATTA/1999 Consorzio Venezia Nuova Saving Venice
By BBC News Online's Tom Housden The remains of what has been described as a huge lost city may force historians and archaeologists to radically reconsider their view of ancient human history. Marine scientists say archaeological remains discovered 36 metres (120 feet) underwater in the Gulf of Cambay off the western coast of India could be over 9,000 years old. The vast city - which is five miles long and two miles wide - is believed to predate the oldest known remains in the subcontinent by more than 5,000 years. The site was discovered by chance last year by oceanographers from India's National Institute of Ocean Technology conducting a survey of pollution. Using sidescan sonar - which sends a beam of sound waves down to the bottom of the ocean they identified huge geometrical structures at a depth of 120ft.