Around late July in 2017 or 2018, a group of four friends from Colorado—Billy, Chuck, Dennis, and Maria—set up a large two-room blackout tent on a gravel wash in Rainbow Basin, situated at the northwestern corner of Lake Nerka within Wood-Tikchik State Park. After encountering deep, sub-audible grunts that physically vibrated their folding chairs and a series of sharp, crisp whistles that closely shadowed Dennis and Maria during a walk, the group constructed a wide 50-foot perimeter using fine fishing lines rigged with 12-gauge shotgun shell proximity alarms.