Peter Larson, a Utah survivalist with a home and family, gave CNN a tour of his elaborate $65,000 bunker he built in the mountains in preparation for what he called “the last days.” There are even developers building luxury underground condos inside abandoned missile silos. The Survival Condo Project in Kansas runs roughly 180 to 200 feet underground. Units there currently run $1.5 million for a half-floor up to $4.5 million for a full penthouse floor.
But you don’t have to break the bank to build a backyard bunker that will keep you and the family safe in the event of nuclear holocaust, extinction-level meteorite impact and/or full-fledged police state oppression. All you need is a decent-sized backyard and the will to survive.
How to Build a Backyard Bunker in 3 Steps
1. The Dig
You want your bunker to be a total secret, or known to exist by as few people as possible. When it hits the fan, and desperate neighbors are trying to escape nuclear radiation or government tyranny, the first place they will come knocking is your bunker.
That said, try and be as discreet as possible when digging the hole. You can do it the old-fashioned way by hiring workers to dig with shovels, or have dig parties with friends who are guaranteed a spot in the bunker when it becomes necessary.
You can rent a small excavator for as little as $50 per hour. The bunker should be 10 feet deep minimum, but for maximum protection from just about anything, go to at least 20 feet.
2. The Walls
Nukemap is an app that can simulate what would happen if a 100 megaton nuclear bomb went off in a given area. Drop one on New York City, for example. Nearly 8 million people would die instantly, and another 4 million would suffer serious injuries.
The residual radiation from the bomb would linger anywhere from a few minutes to several years, according to the U.S. Department of Health and Human Services’ Radiation Emergency Medical Management. The King County, Wash., Health Department recommends a concrete shield to protect yourself from gamma rays.
Get quotes from several concrete contractors who will also reinforce the walls with steel. Reinforcing concrete with rebar doesn’t multiply its raw compressive strength the way some marketing claims suggest. Plain concrete is already strong under compression on its own.
What rebar actually adds is tensile and shear strength. That’s what keeps a wall from cracking under blast pressure or shifting soil, instead of failing all at once.
This will come in handy if an initial nuclear blast hits within a few miles of your bunker. It will also serve as a near-impenetrable radiation shield. Make sure to leave small openings for an air filtration system, sewage elimination and even a spout to capture rain water for drinking.
3. Stockpiling
The last major expense will be for supplies. Batteries, food and water are the items you will want the most. Remember you may not be able to leave the shelter for a year in the event of nuclear holocaust.
The bare minimum amount of water humans need to survive is about 68 ounces (two liters) per day. This means each person needs roughly 193 gallons of water to survive for a year.
Contrarily, humans can survive for weeks without food. Dried foods like jerky and canned goods work best. You can store them at room temperature and they’ll stay edible for years (if you need ideas, refer to this complete survival foods list).
Firearms, ammunition, flashlights, matches, hygiene and first-aid supplies are the other essentials.
You can do all of the above for less than $10,000 if you shop carefully.