Six months before the Global Blackout, Lucas Hellinger mentioned the experiments while introducing Alda Hertzog to Frost. ("The Garden of Forking Paths") While Demetri Noh was held captive, Frost told him that the experiments began to be conducted in the 1980s at a place called Raven River, and that the participants had thousands of flashforwards. ("The Garden of Forking Paths") Gabriel McDow mentioned to Olivia Benford and Shelly Vreede that he and the homeless man were also participants in the Raven River experiments. ("The Garden of Forking Paths")