Current information on the deep boreholes

From 2019, Nagra has been drilling deep boreholes for the detailed investigation of the geological underground in the potential repository siting regions Jura Ost, Nördlich Lägern and Zürich Nordost.

The insight gained from the deep (or exploratory) borehole investigations is used to extend Nagra's knowledge of the underground geological environment. This understanding is essential for ensuring the safety of a repository and allows a reliable comparison of the siting regions and the selection of the most suitable site. The geoscientific investigations in the deep boreholes will focus on the properties of the underground rock formations – particularly those of the Opalinus Clay in which the deep geological repository will eventually be constructed.

So far, over 2000 people have visited the drill sites to take a look over Nagra's shoulder. You are welcome too: at all operational drill sites, the observation platform on top of the information centre is open 24/7.

Guided tours possible again

From Monday, 31 May 2021, guided tours of the Stadel-2 and Stadel-3 drill sites will be available for groups of up to 20 people. Larger groups will be divided up.

The visitor platforms of the Stadel-2 and Stadel-3 drilling sites are open for individual visits 24 hours a day.

We look forward to your visit.

Permits granted by DETEC

Of the 23 submitted permit applications for deep boreholes, Nagra withdrew those for Weiach-3 and Glattfelden. The Federal Department of the Environment, Transport, Energy and Communications (DETEC) has granted the other 21 applications. These are: Bözberg-1, Bözberg-2Bülach, Dachsen, Eglisau, Effingen-1, Effingen-2, Laufen, Marthalen, Remigen-1, Remigen-2, Rheinau, Riniken-2, Stadel-1, Stadel-2, Stadel-3, Trüllikon-1, Trüllikon-2, Trüllikon-3, Uhwiesen and Zeihen.

Two permit applications withdrawn: Weiach-3 and Glattfelden

Nördlich Lägern siting region: In February 2020, Nagra announced that it would withdraw the permit applications for Weiach and Glattfelden. In the northern part of the siting region, Nagra confirmed the existence of fault zones deep underground (media release). The southern part of the siting region, however, is suitable in principle for constructing a repository and will undergo further investigation.

More information on the deep boreholes?

Our special brochure provides a good overview of the purpose of the deep borehole investigations and the procedures involved. You can also find our factsheets on the individual drill sites in the blue text-box "More information" on the right-hand side.

Visit our Nagra blog for more pictures and information.

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