Cover image by Heping Xie on pages 12-24. The image illustrates the operation of the deep in-situ condition-preserved coring and testing technique. The enlarged view emphasizes that a solid film is forming during the coring process to preserve the core sample under in-situ conditions. This technique aims to obtain core samples with preserved in-situ conditions and test them in the in-situ environment to obtain their true physical and mechanical properties.