In 1952 the Grenoble section of the CAF of Lyon including Pierre Chevalier explored the réseau des Grenoblois to a depth of −181 metres (−594 ft)[a].

In the same year, Drôme cavers, unattached to any clubs, found the scialet du Pré de l'Achard which they descended to −410 metres (−1,350 ft).

In May 1990, the scialet des Nuits-Blanches was discovered by the Spéléo club du Veymont and connected to the master cave at a depth of −688 metres (−2,257 ft).

[2] The upstream section of the Blizzard collector was explored by the Fontaine Mountain caving group in July 1994, after climbing a 25-metre (82 ft) waterfall.

This was dived in September 1995 by Frédéric Poggia, resulting in the discovery of 800 metres (2,600 ft) of further river passage with two new siphons and a boulder choke.

[5] A new cave, the Puits Sans Fond-Arche de Noé, located under the summit of Agathe, one of the Two Sisters, with a pitch of 200 metres (660 ft) is potentially also part of the network, but no connection has yet been found as of 2019.