Location of the Grimsel Test Site and how to visit

Location of the Grimsel Test Site

The Grimsel Test Site (GTS) is located at an altitude of 1730 metres in the granitic rock of the Aar Massif in Switzerland. It lies at a depth of around 450 metres beneath the surface and is reached by an access tunnel belonging to the Kraftwerke Oberhasli AG (KWO), the local hydro-power company.

The GTS tunnel system is around one kilometre long and was excavated in 1983 using a full-face tunnelling machine (diameter 3.5m). The Test Site offers ideal conditions for carrying out a wide range of test programmes.

Location of the Grimsel Test Site in Switzerland
Location of the Grimsel Test Site (GTS) in Switzerland - (1) Grimsel Test Site, (2) Rätrichsbodensee, (3) Grimselsee and (4) Juchlistock

Location of the Grimsel Test Site in the Grimsel Pass

Tunnel Layout

Main project locations are shown below.

Grimsel tunnels 2015

 

Visiting the Grimsel Test Site

Visitors at the GTS

Groups are welcome to visit from Tuesday to Friday. The Test Site is also open for group visits on occasional Saturdays.

Visits are possible from the middle of June to the middle of October. The tour of the facilities takes around 2 hours and is free of charge. The visit to the crystal cave (see The Crystal Caves at the GTS)  takes an additional 30 minutes.

Contact / Registration:

Renate Spitznagel
Nagra
Hardstrasse 73
CH 5430
Wettingen,
Switzerland
Tel + 41 (0)56 437 1282
Fax + 41 (0)56 437 1296
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The GTS underground facilities are also available to interested 3rd parties for underground testing and research. The GTS offers cost-effective access to a fully developed, well characterised underground research facility with round the year logistical support - please contact Dr. Ingo Blechschmidt, Head of the Grimsel Test Site, for further details.