The Korean Tunnelling and Underground Space Association (KTA) would like to invite all of you to the International Symposium on Tunnelling and Underground Space Construction for Sustainable Development (TU-Seoul 2013) to be held in Seoul, Korea from March 18 to 20, 2013. The symposium is the first international event prepared by KTA after the successful 2006 ITA World Tunnelling Congress held in Korea. The theme of the symposium is “Tunnelling and Underground Construction for Sustainable Development”. An intellectually scientific technical program will be prepared in consistent with the theme of the symposium. The symposium will provide participants many opportunities to exchange new information and ideas related to tunnelling and underground space construction industry. The venue city is Seoul, a progressive capital with a population of over 12 million. The city is surrounded by beautiful mountains with the centrally crossing Han River. Seoul has many outstanding attractions where the diverse traditional Korean cultures in part are well preserved as the city has been the capital since 1392. Visitors generally enjoy experiencing the mixture of the modern and traditional flavors of Korea. We believe that many of the attractions and have lots of good memories of Seoul and Korea. Participants can also experience “Hanryu” such as K-Pops and Korean TV series. Each member of Local Organizing Committee will make sure that the symposium will be fruitful and memorable. Anticipating your continued cooperation and active participation for the forthcoming symposium, we look forward to welcoming you here in Seoul, Korea