Bug

[OGSTEINER]

I have build in a mountan than a stamm attack me and land in my base with roof.
Srry when that isn't a bug but i think it is one.

[Calahan]

I'm sorry to say but this is a very poor bug report and it's very difficult to understand what your are trying to report. Please can you read the following thread and post as much of the information requested as you can.
https://ludeon.com/forums/index.php?topic=513.0

My best guess at what you are reporting is that some raiders arrived in drop pods and crashed through the roof of your mountain base. In which case this is likely not a bug because not all mountain areas are solid roof, and there can be areas even deep in mountains that have thin roofs. If you mouse over the mountain tiles it should say whether the tile is "Rook roof (thin)" or "Overhead Mountain".

[ison]

Okay, I think it's what Calahan said. So it's not a bug, thanks for reporting anyway.