Abstract: A cooling system, a cooling method utilizing the inventive cooling system, and a chicken product formed using the inventive method. The inventive cooling system comprises: (a) a tunnel-type cooler housing; (b) a first treatment zone provided in the housing for treating articles by injecting carbon dioxide into the first treatment zone toward the articles and by circulating carbon dioxide in the first treatment zone; (c) a second treatment zone provided in the housing for further treating the articles by injecting carbon dioxide into the second treatment zone toward the articles and by circulating carbon dioxide in the second treatment zone; and (d) a conveyor assembly for conveying the articles through the first and second treatment zones. The carbon dioxide injected into the second treatment zone impinges on the articles to a greater degree than does the carbon dioxide injected into the first treatment zone.