On 8 November 2011, the tunnel shell of Boßler- and Steinbühltunnel was put out for tender in Europe. The Boßlertunnel construction was subdivided into two lots of approximately 3670 m and approximately 5100 m in length; the Steinbühltunnel forms a third, independent lot. The contract also involved around 1.32 million cubic meters of excavated material or to be used during the project or disposed of, and the construction of four temporary connection points on the Autobahn 8