CHENNAI, INDIA—Divers, geologists, and archaeologists from India’s National Institute of Oceanography (NIO) say they have found a wall, a flight of stairs, and stone blocks off the coast of the UNESCO World Heritage Site of Mamallapuram, according to an article in The Times of India. The team was following up on eyewitness accounts from tourists at the ancient seaport, who reported seeing a row of granite boulders some 875 yards out when the shoreline receded during the 2004 tsunami. “Some of them are badly damaged due to strong underwater currents and swells. However, we could make out that they were part of a building complex,” said Rajiv Nigam, head of the NIO’s marine archaeology unit. The buildings may have been inundated during a tsunami in the tenth century A.D. To see a slideshow of remarkable images of India's extraordinary stepwells, go to "The Islamic Stepwells of Gujarat, India."