The History of the Indian Underwater Cities

In October, there was a 0.6 earthquake in the ocean, 50 kilometers from Pondicherry on the east coast of India. Earthquakes in that area are unusual; it's a stable part of the continent up in northern India. In northwest India, very bad earthquakes as a result of mountain building processes but in southeast India, no, it's supposed to be stable. It would seem two of these civilizations that are underwater may actually be an earthquake zone.