So Im building my bunker, you know (for when the russians attack!)

Do you plan on putting a pre fabbed building into the hole you dug ? No way will that work
You have to build your basement walls out of 8x8x16 block or concrete poured in place and it needs to be at least 6 inches to support the building on top.

Do like someone else said, put a cargo container in there

I would go with shipping containers. I know several people that have buried shipping containers with no problems.

Shipping containers support weight throughout all sides (thus the corrugation) - not just corners. Considering you can stack them 10 high with loads of up to 10 tons each they can assuredly handle the pressure of several feet of dirt.

[video=youtube;A3EAJex1RVo]http://www.youtube.com/watch?v=A3EAJex1RVo[/video]

Well house foundations are usually 8" minimum.

A good thing to take into consideration is the soil bearing capacity of your soil underneath this bunker. Then you need to figure out your live and dead loads. Probably not much live loads but certainly a lot of dead load would be pressing down on the soil below. To do this just add up the weights of your material and everything above it. So once you figure out your actual load, and figured out how much the soil can hold per square foot(do a soil test for this) you design the footing so the area underneath the footing multiplied by the strength of the soil would be greater than or equal to the load.

So say your load was 4,000lbs a sq. ft. and you get a soil test done and figure out the load-bearing capacity of the soil to be 2,000 lbs a sq. ft. So that means you're going to need to cover 2 sq. ft. or more of area for the footings so a 24 inch wide footing. That your 8" wall would sit atop in the middle. This would effectively distribute the weight of the building and whats above it without digging into the soil underneath and breaking. This would be for your load bearing walls(outside walls). Then you would lay the slab of concrete(usually 4" thick) over the footings all around. If your figure comes out to be less than the thickness of your wall no footing is required.

I would use a rebar enforced ceiling. Not too sure on the thickness there mate.

I'd check local codes to see the regulations for your state and use those as parameters to build.

What i'd do is make a drain type system with crushed stone over the bunker and lay soil over that about 6 inches to a foot thick so it looks normal, this would divert water off to the sides of the bunker below.

Good luck. Sounds epic.

Forget the russians, the iranians will blow your fucking shelter out of the water, with their new super powered warhead (with new nuclear/obtuse,neetak) wait until you see this (hidden) baby in action.
you better buy yourself a second hand space station sonny.

the china syndrome is a drip of water in to the atlantic ocean in comparison to this baby !!

i saw a glimpse of it, because my uncle is a member of the sas (still active) and he showed me some paperwork and blueprints on an excersise coming up to try to de-commission it.
and wipe out the fuckers.

Not trying to be the dick but you need to think this through, no matter what it, won't be "cheap". Get Precast slabs to set over your structure over hanging several feet on three sides. My closest precast company will pour a slab to my specs (think two slabs, 5 foot by 7 foot by three or four inches thick, placed side by side and seal the seam with hydraulic cement) and deliver granted its not to big to haul down the road and can get to the site to set it for you. Yes, you want (poured or block) sidewalls and a solid floor or footing to support the walls. not to mention you need drainage- either a sump pit with a pump or pipes to drain the daylight downhill. don t go through all this work to bury wood. over build it and make it last or just throw in the towel.

Also tri axle(three sets of tires at the rear) dump trucks hold 17-20 tons/yards of material(dirt, not mulch)
doubles hold 10-12, singles hold 6-8, and small ford f550 size hold 3-4 yards
-most dry loamy materials/ dirt weigh in around 1 ton per yard (dug up/fluffed)
-L x W x H divided by 27 will give you cubic yards
As I read it, your hole must be at least 8x12x10 (at least 6ft tall and 4 ft of cover on top of that)
so if you've dug a hole 8x12x10(?) you have removed 35.5 yards of material thats should somewhere around 71111.11 lb, and the four feet of dirt should come in around 28444 lbs-I would bet a wooden roof would fail.

Seems like a huge amount of work for minimal gain. Take that same $100, Rent a garage space and install sheets of that mylar looking crap that blocks IR/FLIR etc... Use T5 Floros for the lights and call it good. Don't try to reinvent the wheel and risk your safety just for a little bud. If you only need a small grow just use a closet and T5 fixtures. Line the closet with IR blocker and there is absolutely no way ANYONE can ever see it through the walls of your house. Your dishwasher gets hotter than that room would. I'm really not trying to criticize your ambitious project. Just struggling to understand the wisdom of it. Wish you had been here before you dug the hole. Good luck dude.

GasTanker- Shipping containers would be wonderful, but there is no way to deliver them, and have them set in the location.

Firsttime- Awesome, some very good information. I will take that into account.
I have 4 pallets of concrete. Honestly I have no idea how much concrete is there, 35-40 bags I guess per pallet. How far will this get me? Do I need more? Im not really interested in having anyone come out to this project if you catch my drift.

WeeGogs- Lol. I believe I am sensing sarcasm, I am not sure. We are aware that this is in-fact not a bunker right?

BeeRite- Don't sense the dickiness. Lol. Some good numbers too. And actually its 12x12x10-8 fluctuates with the weather lol. I agree with you 110% that it should be built to last, but money and time is becoming a major issue, running out of both, as I said this is a place of business, redirecting traffic is becoming increasingly difficult. I feel that if I could build something to last a few years, even one would be significant enough to make a difference the second room build right?
I don't understand "drain the daylight". I assume you just mean everything that is coming in.

Norton- I believe it is worth it, because I own the property and it will serve for years(if it can survive). An indoor grow is just out of the question. I don't really see this being a "small" grow. I don't be any means see it being large, but I don't know many people with anything above a stealth grow, or closet grow. With a 4x12 area I should be able to get something worth while out of that. IR blocker. I will look into that. Could solve a lot. Not looking for a little bud, I would love to see 3 1000w's in there.

Ok lets talk something different. As I said the dirt cover isn't really needed. Putting grass on top of the thing will be fine. Nobody will ever be walking around there, hell I could build a deck over the area...
So all that we need to worry about is the sides. I like the precast slab idea, however if it would involve anymore than the slab being delivered then it won't work. I can't see moving all that weight without equipment either, which won't fit. Pretty much everything will need to be built on site and in place I am thinking.

So walls/drainage/foundation. These are the main issues.

With firstTimes numbers, I actually think Walls and Foundation are pretty much set. 8" walls is a shit load of concrete however...

Drainage, I had assumed that water and soil being what they are, that the water would travel through the soil, be diverted by the building and travel further down. It never really rains enough to completely saturate the ground here. I don't believe too much water would gather. Would it be a better idea though to have say a 55 gallon drum in the ground underneath the building with the water being directed to it with a pump to keep it dry? Is a pit not enough? Wouldn't the water soak into the earth? I think concrete around a wooden structure would work better, being that moisture is absorbed by concrete. I feel this will create an overall very low temp in the winter months with just concrete walls. With the wood to separate the two, should help control temperature? I think I have covered pretty much everything.

I really don't mind criticism, by all means give it, I do value my life. But don't tell me to stop, because that isn't the idea. Lol...

Hire a contractor to do it for you, someone certified that way you dont kill yourself down there.

Yo bro in the US police can't use IR without a warrant. Do an indoor grow. Someone gave you bad info about the police. If you are that paranoid you shouldn't be growing. I'm not trying to be an ass but as long as the smell isn't bad, you don't tell anyone and you don't have any fires or freak occurrences you will be all right.

Where can you get a dump truck of cement but not a septic tank put in? Gotta be some fucking remote ass bunker if trucks can't get to it. Not to mention tons (literally) of physical work.

Any septic tank company (and they are everywhere) can put a container in place for you.

i googled to c what containers weigh ............ i think i can get one in the hole with a loader tractor

look up WW2 pill boxs and bunkers and radiaton theres tables out there that tell you how thick somthin has to be to stop it concrete is only 10inch or sumthin and steel is 3inch. but another idea is concrete reinforced fencese just build a pill box then cover it in more concrete, 10ft wide underground buildin will need surport in the middle theres loads off other sites where people have bult bunkers and all sorts under there house in there gardens the lot. a pill box looks the easist to build and you can submerg them underground. but if you have a room 10ft wide itl need surport in the middle evry 4 to 5ft and your need a good concrete floor i was thinkin bout ft deep then you can pure the concrete round your fence post at same time just all bout meserments. but like evry 1 else says youv gota get it right or your dead theres no misstakes or anything but just google bunkers.

look up this site http://www.instructables.com/id/How-to-Build-a-Super-Top-Secret-Bunker-under-Your-/