Abstracts can still be submitted until 31 May 2022 for the 15th International ISRM Congress, which will be held jointly with the 72nd Geomechanics Colloquium in Salzburg from 9 to 14 October 2023. The theme of the symposium is “Challenges in Rock Mechanics and Rock Engineering”. Abstracts can be submitted online in English via the website below. Each submission must be assigned to a specified session topic. The available topics are also listed on the ISRM website.