This doesn't specifically mention China, but it is about the shift to underground fighting techniques https://www.militarytimes.com/news/your-army/2019/02/26/th

This doesn't specifically mention China, but it is about the shift to underground fighting techniques https://www.militarytimes.com/news/your-army/2019/02/26/the-subterranean-battlefield-warfare-is-going-underground-into-dark-tight-spaces/ https://www.militarytimes.com/news/your-army/2019/02/26/the-...