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From the information Zachary extracted from their souls, the Giant God Soldiers were not built after the disaster; it seems that related research already existed before the disaster struck Blue Star. However, before the disaster, there were no creatures of such massive size on Blue Star,
so the initial method of control was seemingly through the use of chips. But due to various reasons, this research continually encountered problems and was at one point shelved and classified. It was not until the ancient creatures descended, especially the giant ones, that this research resurfaced.
This intel was something Jack had picked up in casual conversations with others, and since he wasn't particularly interested, he didn't delve into the details.
After the flood, unlike Rabbit's Home which built ships, the Life Foundation took control of a turtle-like Giant God Soldier and established their headquarters on its back, making the Life Foundation's headquarters mobile.