"The lesson will be taught in due time, Aloy. Until then, we wait." This article contains heavy spoilers. Read ahead with caution.
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The Gammas were members of the team that worked on Project Zero Dawn, the global terraforming system designed and implemented to restore the Earth to a habitable state and then restore life to it after all life had been eradicated and the Earth rendered sterile by the Faro Plague.
Presumably, as gamma is the third letter of the Greek alphabet behind alpha and beta, the Gammas were the third tier of command and control of the project, subordinate to the Betas, who in turn were subordinate to the Alphas, the lead designers and implementers of the project.
History[]
As the Faro Plague relentlessly advanced and consumed the biosphere during Operation: Enduring Victory, it severely curtailed the time left to complete Zero Dawn by executing an unexpected and highly successful pincer move against the last military salient in Wichita, Kansas, collapsing the offensive's eastern line. As the robots advanced toward the Zero Dawn Project Facility the Zero Dawn team rushed to get the system operational before evacuating to Elysium where they would live out the rest of their lives safe from the then uninhabitable external environment and hostile robots. The Gammas were evacuated first, followed by the Betas. However, the Alphas were forced to stay and permanently seal themselves in GAIA Prime in order to complete the work on the system.[1]
The Gammas and Betas thus spent the rest of their lives in Elysium, the last living organisms on the planet along with the Alphas in GAIA Prime and the few humans in other bunkers. According to a datapoint found by the Nora Brave Aloy while she investigated the remains of the Zero Dawn Project Facility, this would have been no more than 100 years.[2]