The Arkay Dam was a facility out in the Arklay Mountains, directed by Mr. Marker. It was connected to the water sanitation process for drinking water. On September 27, 1998 a plague of rats large enough to cover the nearby lake made its way past the Dam while migrating to the city, where they flooded the drinking water. An employee drank the water and transformed into a zombie, spreading the virus to the rest of the staff in the dam while people in the city succumbed from the water.