Donaudüker, Underground water infrastructure in Linz, Austria
The Donaudüker is an underground pipe system that runs beneath the river, connecting the two banks on either side. The network consists of several parallel lines that carry different types of water through the same route.
The project emerged in the 1970s when the city needed a solution to provide services across the wide river. The drilling technique used at that time was innovative for projects of this scale and set standards for future work.
The facility takes its name from the river it crosses beneath, showing how engineers solved practical challenges posed by the landscape. Visitors can see today how such underground solutions became part of the city's infrastructure story.
The system operates continuously underground and is not directly open to visitors, but can be observed from outside. Entry points are located at specific spots along the riverbank where you can see the technical installations.
Inside the tunnel, electric lights illuminate the passage and reveal the depth of the entire construction beneath the riverbed. This lighting system is rarely visible and gives visitors a vivid sense of the tunnel's massive scale.
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