In the east of city Bern the railway lines from Olten/Biel and Thun joines. So it should build a new traffic system with railway lines in multiple levels. For this a tunnel was needed to move the cables under the railway lines. In a depth of 12m Braumann Tiefbau build a tunnel with diameter of 2500mm (inner) used HERRENKNECHT slurry AVN with mix-shield mode. For controlling and measurement of the settlements a complex monitoring was used and the reception shaft was fullfilled with water, when the boring machine arrives. Full-face technology with mixshield mode.