"The European Union counts not less than 39 570 cavers (2006 figures including Roumania and Bulgaria), members of the 24 national federations inside 22 countries (Portugal and Greece have 2 federations each one). 17 countries are already included in the FSUE membership process. We are still waiting the Information Form from 5 new EU countries (Slovenia, Poland, Slovakia, Hungary, Czeck Republic), if you can please send this form as soon as possible to firstname.lastname@example.org, so that our Treasurer, Jean-Claude Thies, can proceed the membership registration before next FSUE meeting, Thanks a lot for that. Five EU countries have no speleological structure (Finland, Cyprus, Latvia, Estonia, Malta).
This means that including the European non-EU countries (Swizerland, Russia, ex-Yugoslavia, etc), there are more than 40.000 cavers in Europe ! "
Info from: FSUE