Can't unlock underminer
1. create new map
2. open mutators and make everything unavailable
3. make annex unlocked and underminer researchable
4. you won't be able to unlock underminer
Game Version:
Steam Public
Platform:
Windows
Likely related to this:
http://brightrockgames.userecho.com/forums/1-war-for-the-overworld/topics/2791-greed-tree-lock/