Context
Trevelin sits in the west of Chubut, Argentina, about 22 km south of Esquel. A road runs some 12 km from the town to the Futaleufú dam, a hydroelectric complex built between 1971 and 1978. That spring, Argentina was in the middle of a wave of UFO reports. A week earlier, near Pedro Luro, a rally car crew had reported an encounter of their own.