Two more speleobiology seminars were organised at Thessaloniki (March 23-25, 2018), expanding our caver’s network to northern Greece. In total, 16 speleologists from 3 clubs (Thessaloniki Caving Club – PROTEAS, Speleological Group of Kavala and HSS – Northern Greece) participated. Presentations and indoors exercises included an overview on the biodiversity conservation needs of the caves of Creece and animal taxa identification. Field exercises were carried out in caves near Naoussa. Furthermore, a large amount of rubbish (mainly plastic) was removed from the cave “Apano Skala” in Naoussa. We are grateful to the School of Sciences of the Aristotle University of Thessaloniki and the Professor Evangelia Tsoukala for the concession of the lecture hall.