Sweden is home to more than fifty underground bunker substations built during World War II. Concealing powerful generators, bomb-proof, cooled by underground rivers, these structures still look like they can survive anything "Half-Life"
Upgrade your Doomsday bunker. #bunkerplans
How To Build A Root Cellar This is a great project on how to build a root cellar or a secret underground bunker if that is what you want. For those unfamiliar with the term, a root cellar is an underground room that acts like a natural refrigerator, maintaining temperatures in the mid 30’s F in the…
It is essential to skillfully conceal your tunnel exit. http://codegreenprep.com/2014/08/escape-tunnel-retreat/