 For the Krenak indigenous people who live along the Rio Doce in southeastern Brazil, the waterway was their communitys lifeblood, a source of food and spiritual presence, where children were baptized and learned to swim. Five years later, the tribe says survival remains a struggle, despite living hundreds of kilometers downstream from the burst dam, and mourn a revered river they have long known as Uatu: a sacred, omnipresent relative. Uatu has died, Djanira Krenak, a 70-year-old Krenak matriarch and pajé, or spiritual leader, told Reuters in a video call -- her first, on a borrowed phone. 