The 800-meter-long route for the Seo Cho cable tunnel contained five curves with narrow radii of 200 to 250 meters. A further challenge was a safe advance with a target shaft in the cellar of a multi-storey building, where a new subway station was being built. In the heavily built-up area of Seo Cho it was not possible to set up a deep target shaft without completely blocking off one of the busy streets.
An expanded AVND2400AH mastered the tunnelling job, which can be described as "the mother of all pipe jacking projects". Due to a lack of space at the start shaft the pipes had to be delivered just in time, to save time with regard to handling. An automatic lubrication system kept the thrust forces lower than expected despite the extremely abrasive granite, so that only four of the nine intermediate jacking stations installed had to be used. The project was successfully completed in March 2003.