You can limit access to your mine with the use of a [[mine door]]. Several types of mine doors are available. <br>
Remember that offdeed minedoors can be bashed, so your mine is not entirely safe just because it has a mine door attached. Perimeter does '''not''' protect mine doors.
Walls can be built around any slope of tunnel entrance by standing within the mine and selecting the tile borders. Note that you should build these walls [i]before[/i] placing a mine door if you wish to install one aswell.
=== Tunnel Excavation ===