The 2nd CTBT Science Diplomacy Symposium was held from 21 May to 1 June 2018 at the Vienna International Centre. Its aim was to raise public awareness of the CTBT's contribution to international peace and security, and to encourage cooperative and collaborative research and innovation on nuclear test monitoring science and technology. The Symposium also hopes to stimulate creative thinking about possible political, legal and diplomatic solutions among diplomats, practitioners and policy makers, academics, and the next generation to the challenges facing the Treaty.