The man in the video is Mahayogi Satyendra Nath, leader of the Kaulantak Peeth. A practitioner of the Siddha Himalayan yoga tradition. The video was captured by his disciple Rahul, who often accompanies him and documents his practices.
Rahul said that Satyendra Nath was in a deep meditative state at a temperature of -55°C, and that he did not feel any discomfort or cold.
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