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G617g was the first planet in the Milky Way to be infected by Flood.

A research team called the Primary Pioneer Group made landfall on the border town planet known as G617g and they initially reported some interesting findings. Despite previous assumptions, the world could support life and they’ve found interesting fauna, which they intend to review more closely. The protocol allows them to dispatch a secondary batch of researchers called the Advance Survey Team-Alpha. After a week of no communication, the Forerunners who were remotely monitoring this new discovery become worried.

In their response to the initial report, those monitoring it advised that they would send a military detachment to the site shortly to uncover why their two exploratory teams have halted communication. That would be the last time the Forerunners had any contact with G617g, and it was the beginning of the largest war their galaxy would ever see. No one knows why the Flood were dormant on G617g or even how long they had been there before, but it is believed that due to their vastly different physiology, they traveled to our galaxy from another.