Ancient Underground Opening and Preservation contains 59 papers presented at the International Symposium on Scientific Problems and Long-term Preservation of Largescale Ancient Underground Engineering (Longyou, China, 23-26 October 2015). The contributions focus on scientific and technical issues related to long-term preservation of large-scale ancient underground engineering around the world. The following topics are included in this volume:

1. Scientific issues facing the Longyou Grottoes
2. Weathering prevention and long-term protection strategies for the Longyou Grottoes and...