radioed for an urgent airdrop of firearms so the crew could defend themselves, but did not receive them. Heavy seas kept the islanders away from the ship. After a week, the crew were rescued by an Indian navy helicopter. On 4 January 1991, Triloknath Pandit made the first known friendly contact with the Sentinelese. Until 1996, the Jarawa met most visitors with flying arrows. From time to time, they attacked and killed poachers on the lands reserved to them by the Indian government. They also killed some workers building the Andaman Trunk Road (ATR), which traverses Jarawa lands. One of the earliest peaceful contacts with the Jarawa occurred in 1996. Settlers found a teenaged Jarawa boy named Enmei near Kadamtala town. The boy was immobilized with a broken foot. They took Enmei to a hospital, where he received good care. Over several weeks, Enmei learned a few words of Hindi before returning to his jungle home. The following year, Jarawa individuals and small groups began appearing along roadsides and occasionally venturing into settlements to steal food. The ATR may have interfered with traditional Jarawa food sources. On 17 November 2018, a United States missionary, John Allen Chau, was killed when he tried to introduce Christianity to the Sentinelese tribe. The Sentinelese have been protected from contact with the outside world. Trips to the Island are prohibited by Indian law. Chau was brought near the island by local fishermen, who were later arrested during the investigation into his death. Indian authorities attempted to retrieve Chau's remains without success. Tribes The five major groups of Andamanese are: Great Andamanese, traditionally of the Great Andaman archipelago but now living on Strait Island. Their population was 52 as of 2010. Jarawa traditionally of the southern part of South Andaman Island in the Great Andaman archipelago but now living in the ex-Great Andamanese homeland in the West Coast and central parts of South and Middle Andaman Islands. Their population was 380 as of 2011. Jangil or Rutland Jarawa of Rutland Island, extinct by 1931 Onge of Little Andaman, at 101 individuals as of 2011. Sentinelese of North Sentinel Island, estimated to be 100 to 200 individuals. By the end of the eighteenth century, there were an estimated 5,000 Great Andamanese living on Great Andaman. Altogether they comprised ten distinct tribes with different languages. The population quickly dwindled to 600 in 1901 and to 19 by