Creating Underground Beauty That Reflects Safety and Convenience.

Since 1980, ULTRA has stood peerless in subway construction in Seoul, boasting both the greatest mileage of successful operation and the most aesthetically pleasing and convenient subway and train stations.ULTRA takes great pride in having undertaken the most complex subway tunneling in downtown, employing high-precision technology and ultra-modern equipments such as TBMs, always keeping patrons’ safety and convenience in mind.Ultra participated in the construction of Subway lines 1,2,3,4, and 5, two sections of theBundang line, the Ilsan line, the Honam railroad, and the Daegu Subway.Most recently, ULTRA has successfully finished the construction of High Speed Railway project spanning Seoul to Busan which were specially designed for its solid structure of bridges and tunnels, providing safety and convenience at the maximum speed of 300km/h.