Grimsel Space Mission
GTS 40 years
Grimsel Test Site

Grimsel Test Site

Underground Research Laboratory



A student led analogue space mission

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CRIEPI’s Fractured Rock Studies

Gast Experiment


The Gas-Permeable Seal Test experiment

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Welcome to the Grimsel Test Site (GTS)

The Grimsel Test Site (GTS) is located in the Swiss Alps and was established in 1984 as a centre for underground Research and Development (R&D) supporting a wide range of research projects on the geological disposal of radioactive waste. International partners from Europe, Asia and North America are working together at this unique facility.
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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.

The GTS Facilities for Partners
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To meet the various needs of training and knowledge transfer, the GTC team developed a programme which allows both tailor-made and established courses. High quality and relevance of the courses is achieved by involving lecturers from the GTS partner organisations.

Grimsel Training Centre

GTS Projects

There are many and varied projects running in the Grimsel Test Site. Explore the background and status of these active experiments.

GTS Partners

Become a partner at the GTS and use the fully equipped and supported GTS facilities for your projects.

GTS Training

View our upcoming tailor-made and established courses involving lecturers from the GTS partner organisations.

GTS Newsletter

View our latest Newsletter or browse previous editions.

South Korea
United Kingdom
United States

A few examples of presently runing projects at the Grimsel Test Site (GTS)

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View the CFM Project

CFM Project

The CFM (Colloid Formation and Migration) project aims to enhance understanding of the processes related to colloid formation at the bentonite/host rock interface.

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View the HotBENT Project

HotBENT Project

HotBENT aims to evaluate current accepted safety functions by investigating the effects of high temperatures on bentonite-based barriers and their safety functions.

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View the ISC Project

ISC Project

ISC (In-situ Stimulation & Circulation Experiment) aims to improve our understanding of geomechanical processes underpinning permeability creation during hydraulic stimulation and related induced seismicity as well as to evaluate the efficiency of the generated underground heat exchanger.

Virtual Tour through the Grimsel Test Site (GTS)


Explore the GTS in a "street view" style point and click explorer.


Navigate through the GTS tunnels using a point and click navigation similar to Google street view. Explore the facilities, tunnels and all the project locations throughout the GTS.
Launch Virtual Tour
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