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From Brave AI:

Lost City Off India

An underwater city off the coast of the southern tip of India was discovered near Mahabalipuram, also known as Mamallapuram. This discovery was made possible after a tsunami in 2004 revealed ancient ruins that were previously covered by silt and sand. Archaeologists found structures such as a temple, stairs, and walls, confirming local folklore about the existence of a lost civilization. Further exploration using sonar technology has since confirmed the submergence of a large area that could be the remains of a submerged township.

Another significant underwater discovery in India is the Gulf of Cambay site, where marine archaeologists found huge geometrical structures using sonar scanning technology. This site, thought to be around 9,500 years old, could predate the oldest known remains in the subcontinent by more than 5,000 years.

Additionally, underwater archaeologists are searching for the foundations of the city walls of Dwarka, an ancient city said to have sunk beneath the Arabian Sea, to prove its existence.

AI-generated answer. Please verify critical facts.

[SunkenCiv]

Wow, your Brave search term must have been way better than mine. :^)

[IndianChief]

underwater archaeologists are searching for the foundations of the city walls of Dwarka, an ancient city said to have sunk beneath the Arabian Sea, to prove its existence.

There is a documentary on the underwater city of Dwarka, just of the coastal town of modern-day Dwarka. Recently the Indian PM also dived to the ruins underwater. The original city was one of the most holy sites for aancient Hinduism, associated with the Lord Krushna.