The Grimsel Tunnel () is a proposed tunnel for power transmission and rail transport in Switzerland. s of 2016[ [update]] it was planned to run under the Grimsel Pass and link the Zentralbahn at the north end with the Matterhorn Gotthard Bahn at the south, with planned opening in approximately 2025. The Canton of Bern, Canton of Valais, and Swissgrid unveiled their joint plans on 4 February 2016.