The International Society for Subsurface Microbiology (ISSM) is made up of microbiologists, ecologists, geoscientists, and other researchers around the world fascinated by the various aspects of subsurface microbiology, a rapidly expanding field that focuses on microbial life below the surface of the earth. ISSM has organized numerous symposiums on subsurface microbiology in locations as diverse as Germany, Japan, New Zealand, USA and the UK. These symposia are meant to showcase the latest technologies and research in subsurface microbiology, including microbial ecology. The International Society of Subsurface Microbiology is honoured to invite you to its 11th international conference in Utrecht (The Netherlands) in June 2020. Abstracts due in September 2019.