The symposium entitled “The 4th International Symposium on Underground Excavations” was successfully held in Istanbul on 13-14 September 2018. The symposium was organized by the Chamber of Mining Engineers of Turkey (Istanbul Branch) and Turkish Tunnelling Society. 394 delegates participated into symposium. In the symposium, there were 4 keynote speakers and 55 presentations in total. There was an exhibition hall, where companies related to mining and tunneling sectors could present their products and services. Supporters were awarded by plaque at the gala dinner on the first day of organization.