---
title: A hydraulic tunnel designed by SYSTRA in Norway
url: "https://www.systra.com/en/news/a-hydraulic-tunnel-designed-by-systra-in-norway/"
type: post
date_published: 2026-03-13
date_modified: 2026-03-13
schema:
  @type: Article
language: en-US
word_count: 369
reading_time: 2 min
canonical: "https://www.systra.com/en/news/a-hydraulic-tunnel-designed-by-systra-in-norway/"
featured_image: "https://www.systra.com/wp-content/uploads/2026/03/image-5-1.jpg"
categories:
  - Non classé
---

# A hydraulic tunnel designed by SYSTRA in Norway

![A hydraulic tunnel designed by SYSTRA in Norway](https://www.systra.com/wp-content/uploads/2026/03/image-5-1.jpg)

The E6 project, also known as the Rentvannstunnel, reached a major milestone on
20 January with the final breakthrough by the ‘Laila’ TBM. This factory train
dug 11km under the bedrock of Oslo to build a key infrastructure for the
capital’s authorities, who aim to make water transport and supply more reliable
and robust.

It will draw water from Holsfjorden, west of Oslo, to a new underground water
treatment facility at Huseby, and distribute it across the Norwegian capital.

SYSTRA Italy, in partnership with Sweco Norge, is accompanying underground civil
engineering studies on behalf of the AF Gruppen-Ghella consortium, including
segments, technical and safety niches, and tunnel boring machine launch
structures. This tunnel will be connected to the nerve centre of Oslo’s new
drinking water system.

![paolo-fantini](https://www.systra.com/wp-content/uploads/2026/03/paolo-fantini-1.jpg)

> We are proud of the innovative and sustainable solution adopted for the TBM
> segmental lining design of Oslo’s E6 Clean Water Tunnel. This 11-km tunnel
> will provide a resilient and reliable water supply for the capital, marking a
> key milestone in Norway’s infrastructure security.
> Paolo Fantini, Senior Geotechnical Engineer, SYSTRA Italy

In addition to the TBM drive, the project includes about 7 kilometres of Drill &
Blast tunnels that connect to the existing facilities, including the network
associated with the Maridalsvannet water treatment plant, which currently
supplies roughly 90% of Oslo’s potable water.

## Creating a more robust water supply

Once complete, Oslo’s upgraded clean-water system will strengthen east–west
distribution, access larger reservoirs, and provide full backup capacity for the
city, improving resilience in case of issues with the existing supply.

## Water, a key adjacent market for SYSTRA’s development

In our drive to develop adjacent markets, SYSTRA is accelerating its presence in
projects related to water and hydraulic infrastructure, drawing on its expertise
in complex underground projects and transport infrastructure.

In addition to a recent contract for a
[water production plant in Australia](https://www.systra.com/en/news/systra-diversifies-in-australia/)
and a water tunnel study in India in 2023, the E6 Rentvannstunnel project
illustrates how tunnel construction, systems integration and risk management
translate into vital infrastructure beyond transport.

## Some images of the tunnel breakthrough

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