I've always seen these challenges as primarily to challenge yourself, and that's hardly a viewpoint I can keep up with a clean conscience without entering this one! I've never done an underground map, but I do find caves and crypts quite fascinating, so I don't really know why I haven't explored that genre before. Anyway, here's my first sketch. It shows an ancient tomb, viewed from the side, and then becomes a cave system, where the archeologists stumble on the sealed entrance to a completely different, probably even older, underground complex.

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grotta1.jpg