[natehale1971]

From what they said about the pyramid design... it's a design that won't crumple like a square or rectangle design since it spreads out the weight equally to the edges instead of ontop of itself. This is why i was thinking of the Pyramid shape for the boltholes and caches... it'd be more capable of withstanding the stresses of being buried.

Yes you'd be doing a lot of digging, but you're gonna have to do that digging anyway. the hole you dig for a bolthole or cache is already going to have to be bigger than what you're burying. you have to make the hole big enough to put the facility in the ground, and also so you can pour the concrete slap you're gonna put the bolthole or cache on.. and to create your 'vault' that would go around said faclity to keep from having water seepage from getting into the underground bunker.

If i remember this right, you have a good two foot area round the underground construction where you put the gravel and sand to act as a barrier. Or at least, that's what dad did when he built a house on the side of the mountain back when i was a kid. a good third of the house ended up being underground as it went up the side of the mountain. And he had to make sure that it'd be stable and able to withstand any geological shifts.

i don't know if that's something you'd have to do for underground construction in other areas. but the pics i've seen of bunkers being built back in the 50s and 60s, they did something similar... but with more of a 'vault' area around the bunkers... and they did something my dad had done, and put rebar in the concrete and in the vault area. So it's possible.