This is a prequalification for participation in a tender contest with negotiations regarding execution of the contract, which includes supplementations and connection to the existing concrete encased duct runs (OPI ducts) and other trench lines. The main parts of the trenches shall be executed as re-cast pipes in the form of concrete encased duct runs (OPI ducts). The contract involves the supplementation and continuance of trenches that shall be included in the project T3 (the New terminal building). These are trenches that are necessary in order to relocate the new switch station for network power to BKK, and the establishment of a new Electro station for backup power to Avinor.