1. Randy Random Rough 17B.
2. An infestation spawned on a river bed that passed through a mountain. Shallow water tile. Overhead mountain roof.
3. Did not think this would be a viable location for the insects to burrow out of. I understand its under mountain but thought the flooding of a tunnel would have limited this.
4. Sorry no saved game was playing Permadeath and my colony was wiped out later that session by tribals.
bump
hmm, I think it's ok if it was shallow water. Thanks for reporting anyway.