French Federation of Speleology 10 years, named the "Bulletin of the CNS". Simultaneously, the SSF ceased publication of its periodical bulletin to provide its official information bulletin in the new "CNS". From 1952, cave training courses were organised in partnership with the Ministry of Youth Affairs and Sports. From 1953, Guy Lavaur organised cave diving activities. In conjunction with the Fédération nationale de sauvetage (National Rescue Federation), a certificate of first degree fitness was created in 1954. The first International Congress of Speleology was held in Paris from 7–12 September 1953 under the patronage of the Minister of National Education, as well as the
French Federation of Speleology 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 , of which he was President. Three hundred cavers from the CNS and the SSF took part in the event, from 6–10 September 1959. It gave rise to the presentation of 26 papers and five different films and inspired in the participants a desire for unification. The year 1961