FILE – Clouds hang over the North Sentinel Island, in India's southeastern Andaman and Nicobar Islands, Nov. 14, 2005.

Clouds hang over the North Sentinel Island, in India's southeastern Andaman and Nicobar Islands, Nov. 14, 2005. (AP Photo/Gautam Singh, File) ...

Visitors are banned from traveling within 3 miles (5 kilometers) of North Sentinel Island, whose population has been isolated from the rest of the world for thousands of years.