A 335-meter-long underground passage that remained closed beneath central Seoul for more than four decades opened Monday as a cultural venue, launching with an immersive exhibition to celebrate Big Bang’s 20th anniversary. Located 13 meters below Seoul Plaza between City Hall and Euljiro 1 (il)-ga stations, the formerly sealed-off space, now known as K-Culture Station, measures 9.5 meters wide and covers 3,261 square meters. The passage lies between Korea's first underground shopping arcade and