Chau became interested in attempting to convert the
Sentinelese to Christianity in high school, As part of these trips, Chau traveled to the
Andaman Islands in 2015 and 2016, but did not visit
North Sentinel Island at that time. In 2017, Chau participated in "
boot camp"-style missionary training by the
Kansas City-based evangelical organization All Nations. In October 2018, Chau established a residence at
Port Blair, capital of the
Andaman and Nicobar Islands, where he prepared an initial contact kit including picture cards for communication, gifts for the Sentinelese people, medical equipment, and other necessities. However, visiting North Sentinel Island without
government permission remained illegal under the Andaman and Nicobar Islands (Protection of Aboriginal Tribes) Regulation, 1956. In November, Chau embarked on a journey to North Sentinel Island, asking in his diary if it could be "Satan's last stronghold on Earth", In preparation for the trip he was vaccinated and quarantined, and also undertook medical and linguistic training. Chau paid two fishermen to take him near the island. The fishermen were later arrested. On another visit, Chau remarked that the Sentinelese had again acted hostile, but had also shown amusement and curiosity. He sang Christian hymns to them from his canoe and tried communicating in
Xhosa, after which they often became quiet. Other attempts to communicate such as echoing the tribesmen's words ended with them bursting into laughter, making Chau theorize that they had been cursing at him. In what would be his last letter, Chau described a later attempt at contact, during which a Sentinelese boy had fired a metal-tipped arrow which pierced the Bible he was holding against his chest, forcing him to withdraw once more. On what became his final visit on November 17, Chau told the fishermen once again bringing him to the island to leave without him. Sometime during this visit, Chau was fatally shot by Sentinelese arrows. The fishermen later reported seeing the Sentinelese drag his body and, the next day, bury him on the beach. A murder case was opened following his death. The incident drew global attention from journalists. Chau's father also blamed his son's death on the missionary community for instilling what he believed was an extreme Christian vision in Chau. == Analysis and legacy ==