What is north sentinel island language?

The language spoken on North Sentinel Island is unknown as the Sentinelese people have remained largely isolated from the rest of the world. They have their own unique language and it is assumed that it has developed over many centuries. It is a verbal language and no written script has been found. Attempts to communicate with them in other languages have been unsuccessful. Their language is considered one of the most endangered in the world as there are only a few hundred people who speak it.