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

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

The young American had twice attempted to visit the island in the past, and left a can of Diet Coke and a coconut as offering for the tribe this time after he failed to contact the Sentinelese. He ...