Printed from: http://braemoor.co.uk/crolles/therese.shtml on 23 Aug 2017
Copyright: © 2017 - 2017 John Gardner

Réseau de la Dent de Crolles

Gouffre Thérèse

Northing: 45.31821° Easting: 5.86458° Altitude: 1,925 m

How to find it

Gouffre Thérèse is located in a shallow valley 130 metres north of the summit of the Rocher du Midi. It is most easily approached from above, but with a GPS it can also be readily accessed from the lower path that makes its way along the eastern flank of the plateau. This can be reached from a thin path heading towards the Rocher du Midi from the junction of the summit path and the GR9. Note that the entrance is 70 m north-east of the position indicated on the IGN map.

Map of Dent de Crolles showing position of Gouffre Thérèse

Showing location of Gouffre Thérèse on the IGN 1:25000 map 3334OT
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The entrance of Gouffre Thérèse

Entrance of Gouffre Thérèse
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The identifying label at the entrance of Gouffre Thérèse

The identifying label at the entrance of Gouffre Thérèse
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Further information

In 1974 Gouffre Thérèse became the second cave on the plateau to be linked into the Réseau de la Dent de Crolles. It is a far more of a challenge than P40. Because it descends into the Guiers Mort the through trip is almost twice as deep as that of the P40 - Trou du Glaz, twice as long, and it also requires twice the rope. There are a number of detailed descriptions available on the web, but the best and most detailed is that produced by the local rescue organisation, the Spéléo Secours Isère. Progress is mainly made in meanders, and as with many French meanders there are a number of possible routes, some of which have been described in detail on the web. The one described above, however, has been equipped with traverse lines and belay chains. The trip requires a couple of 60 metre ropes, and typically takes about 12 hours. The traverse is characterised by complex route finding, some deep pitches, and traversing in meanders. It enters the Grotte du Guiers Mort in the Galerie Véronique, and from there the route is waymarked. The cave is flood-prone so conditions should be reasonably dry. The normal approach is from the Col du Coq, and the exit is in the Perquelin valley, so attention should be paid to transport logistics.

The Spéléo Secours Isère route guide for the Gouffre Thérèse to Grotte du Guiers Mort traverse has been loosely translated by the author, and is available here. Use at your own risk...

Pull-through chains on the entrance pitch of Gouffre Thérèse

Pull-through chains on the entrance pitch of Gouffre Thérèse
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