The association offered assistance (including financial) to cavers and prepared special legislation for the exploration, discovery and exploitation of underground systems.

The Spéléo-club de France published a quarterly newsletter and a Spelunca journal (2nd series) for the publication of scientific papers and detailed accounts of exploration.

The SSF was no longer the only national association: the Club alpin français (CAF) had also begun speleological exploration and had made many significant discoveries.

In 1945, various government agencies recognised the value of groundwater studies: With the help of these organisations and with support from well-known names such as Bernard Gèze, in 1946 the Annales de spéléologie began publication, under the double label of the SSF and the CAF.

In 1948 after the end of World War II, René Jeannel, known for his research in biospeleology with Emil Racoviţă, founded a commission of speleology within the Centre national de la recherche scientifique (CNRS).

In conjunction with the Fédération nationale de sauvetage (National Rescue Federation), a certificate of first degree fitness was created in 1954.

The conference consisted of seven sections of work: hydrogeology and karst morphology, physical chemistry, meteorology and crystallography, biology, human habitat, surveying and topography, photo and film and equipment and techniques of exploration.

The financial situation became extremely difficult, firstly because of its intense activity and partly because of the production of numerous publications including the Proceedings of the International Congress of 1953.

At the general meeting of the CNS appointed 10 May 1958, Geo Marchand was designated to organise the 2nd National Congress of Speleology in Cahors in 1959, with the group Spéléologique du Quercy, of which he was President.

After a consultation of cavers on 1 June 1963, at the national convention of Millau, the CNS and SSF assembled to form the French Federation of Speleology (FFS).

On 3 June 1963, the new board elected the first office of the federation, which was composed of: The FFS then resumed publication of the Spelunca 4th series newsletter with four issues per year.