Day 277: Not sure how I did it, but some flour and egg white seems to have covered up the ink on the map nicely. I’ll have to see how it ages to see if it works.
Meanwhile, I dug one layer down from the giant chamber and found that this new chamber was right next to one I’d dug previously, so that was a nice piece of convenience for a change. Most of my work at this level looks like it’s going to be smoothing things out and making them neat. I like neat things, they’re easier to measure, and easier on the tools.
I’m still not totally confident in my maps, but I’m really confident in my pickaxes, and that’s the important part.