This is a Sadhguru Sri Brahma water samadhi place inside the water tank near Palani hill, Tamil Nadu. There is also a Sadhguru Sri Brahma temple to the west of tank where you can sit sit and meditate.
“There is a place called Brahma Theertham at the foothills of Palani. Sadhguru Swami was in a state of Jala Samadhi here. Some people who saw him underneath the water, reported to the collector that somebody has died in a pond. When they took him out of the pond, they realized he was still alive. It was after a few days that swami came out of his meditation.” Sadhguru Sri Brahma Documentary Part 3
Map: https://maps.app.goo.gl/gherEHLYvmgQgxri9
Source:
https://www.youtube.com/watch?v=EFnoZ_D0nKo&list=PLUn-AVDbwUrmru8s3WaJXWJ8WHFC2T1F4&index=3
