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The Mont Terri region in Canton Jura, with the medieval town of St-Ursanne on the Doubs river in the foreground. (Image: Comet Photoshopping)
The former limestone factory in St-Ursanne, where the offices of the Mont Terri Project are located. (Image: Comet Photoshopping)
Mont Terri Rock Laboratory
Tunnels and niches of the Mont Terri Rock Laboratory. The Laboratory is located around 200 metres below ground surface; access is via the security gallery of the Mont Terri motorway tunnel. (Image: Nagra)
Mont Terri Rock Laboratory
The Rock Laboratory is located in the Opalinus Clay. Thirteen partners (including Nagra) from Switzerland, other European countries, Japan and Canada are involved in the experiments. The objective of Nagra’s activities in the Laboratory is to supplement its site-related investigations in the Opalinus Clay in Northern Switzerland. (Image: Comet Photoshopping)
Drill-head of a roadheader used to extend the Laboratory facilities in 2008. (Image: Comet Photoshopping)
Roadheader used to extend the Laboratory facilities in 2004.
A scientist mapping clay strata in the field. (Image: Comet Photoshopping)
Drill-bits are used to excavate cores from the rock. The cores are used for various purposes, for example detailed investigation of rock formations located deep underground. (Image: Comet Photoshopping)
Large drillcore from the Opalinus Clay
This large drillcore from the Mont Terri Rock Laboratory shows that the Opalinus Clay underground is a compact rock formation. At the earth’s surface it is often crumbly or loamy due to the influences of weathering. (Image: M. Thury)
HG-A experiment (Gas Path Host Rock & Seals)
In the HG-A experiment, researchers are investigating gas flowpaths through the Opalinus Clay. The photograph shows an engineer testing measuring equipment installed in the microtunnel by a technician. (Image: Pixsil)
A microtunnel being reinforced before installation of a packer system. Packers are plugs used to isolate observation zones in a borehole or a small tunnel. (Image: Comet Photoshopping)
Installing the packer system. (Image: Comet Photoshopping)
EB (Engineered Barriers) experiment
The EB experiment is investigating the technical feasibility of realising an emplacement concept for radioactive waste. The photograph shows a waste container (blue) lying on a plinth of bentonite blocks. The remaining voids are backfilled with bentonite granulate. There is no radioactive waste in the container. (Image: Comet Photoshopping)
Ventilation Test (VE)
Microtunnel where a ventilation test is being carried out. The clay is dried out by blowing in dry air and its swelling behaviour is then tested by introducing humid air. (Image: Comet Photoshopping)
Every Mont Terri project partner can organise guided tours of the Laboratory. Nagra offers tours for groups of up to 30 persons (registration with Renate Spitznagel 056 437 12 82). (Image: Comet Photoshopping)
During a tour, experts explain the experiments in the Rock Laboratory to visitors. (Image: TimeLineFilm)