December 2021 - Construction underway; August 2020 - Construction works of Rastatt tunnel postponed till autumn; August 2019 - Construction has been suspended since August 2017 due to the collapse of newly constructed eastern tunnel bore and the tunnel is now set to open in 2025 instead of 2022; May 2016 - Construction commenced; August 2014 - Contract worth USD418mn awarded to a JV of Hochtief and Strabag subsidiary Zublin; Tunnel is part of EUR11.6bn (USD12.9bn) Karlsruhe - Basle rail line upgrade project