BBCに書いてあるよ

"Police said Chau had previously visited North Sentinel island about four or five times with the help of local fishermen," journalist Subir Bhaumik, who has been covering the islands for years, told BBC Hindi.

"The number of people belonging to the Sentinelese tribe is so low, they don't even understand how to use money. It's in fact illegal to have any sort of contact with them."

In 2017, the Indian government also said taking photographs or making videos of the aboriginal Andaman tribes would be punishable with imprisonment of up to three years.