After you explore all of the regular ruins, three surveyor friends of Cox's will come to Aurora and discover a new ruins outside the city wall. Sam is the woman in charge, Michael is the muscle and Ricky is the newbie. They all take care to keep the area under strict surveillance, and don't let anyone in without an o.k. from Cox.
Sam was misnamed Samuel in the game when it was localized, but they left her avatar as a woman.
Unfortunately, while they are excavating, there is a large earthquake that rocks the city. This uncovers the entrance to a tunnel that leads to the Sealed Underground Ruins.