30 meters below Stockholm City...
From wiki: “Kungsträdgården is a station of the Stockholm metro, located in the district of Norrmalm. It is the end station of line 10 and line 11 and was opened on 30 October 1977, as the 91st station and part of the one-station extension from T-Centralen.[1] The platform is located approximately 34 meters underground. The station features relics rescued from the many buildings pulled down during the redevelopment of central Stockholm during the 1950s and 1960s throughout the station.[2]”
