Open invitation to tender, deadline 07/07/2023, for construction of the 1.2km Ingenbohl drainage tunnel (Lot 404) for the the new N4 Axenstrasse project. The tunnel will drain the mountain water directly into the Lucerne lake near Brunnen. For further information please click here (German) and/or here (French). Duration of contract is from 02/04/2024 to 29/08/2025. Contact Projektleitung Bauherrngemeinschaft N4 Neue Axenstrasse, c/o Tiefbauamt Canton Schwyz, Schwyz, email submissionen.tba@sz.ch. Visit https://ted.europa.eu/en/notice/-/detail/232990-2023. 16/23.