Source (With better quality and additional panels):https://www.webtoons.com/en/slice-of-life/bluechair/ep-1109-yuri-cavern/viewer?title_no=199&episode_no=1281
Source (With better quality and additional panels):https://www.webtoons.com/en/slice-of-life/bluechair/ep-1109-yuri-cavern/viewer?title_no=199&episode_no=1281
I would love to make some underground tunnels but alas there is no solid rock for a hundred feet below my house
Then you need concrete. And lots of it.