The International Symposium on Machine Learning & Big Data in Geoscience (ISMLG) focuses on the use of computational solutions, particularly Artificial Intelligence and Big Data, for the Geoscience. The 4th edition of the symposium is hosted by University College Cork. The activities of the COST Action CA18110 are ahred in the symposium through the Special Session “Data-driven solutions for underground built heritage modeling, preservation and valorization” organized by Pinar Karagoz, Alfonso Bahillo Martinez, and Giuseppe Pace, and also with two presentations: “U4V Platform: a conceptual framework” by Giuseppe Pace and “Devising a Uniform Description of Underground Built Heritage Sites” by Pinar Karagoz.