The body of American missionary-adventurer John Allen Chau may never be recovered from the lost island, where he fell in a volley of arrows fired by a reclusive tribe whose existence is threatened by the modern world, say experts.

The menace to the Sentinelese from Chau's one-man invasion is such that tribal rights specialists say no murder charges will ever be laid and Chau's body will have to stay hidden to protect what is probably the world's last pre-Neolithic tribe.