The ruins are located close to the popular tourist destination and UNESCO World Heritage Site, Mamallapuram, in the southern Indian state of Tamil Nadu. Just before the devastating 2004 Asian Tsunami hit, the ocean receded several hundred feet, and tourists reported glimpsing large stones and boulders in the distance.
Most of the ruins are thought to be about 1,100 to 1,500 years old. Brick structures were also identified on the seabed which may date back to between 300 BC and 200 AD, a historical period in Tamil Nadu known as the Sangam period. The area is believed to have been submerged in the aftermath of a tsunami that hit the coast in 952 AD. The surviving temples are dedicated to many different deities, making it unusual among temples of that period, which were usually dedicated to the god Shiva.
I've no comments or questions - just thought people would like to read about it, if they hadn't already heard of the discovery.