Build Your Own Bomb Fallout Shelter Plans DIY Underground Survival Bunker Safe. These plans were developed to have a bomb / fallout shelter in your yard while looking aesthetically pleasing. It is designed so that it looks and functions as a great looking patio in your back yard. Follow the plans and you will have a protection factor of at least 40. It will fit 6 adults. It will measure 12' 8” X 9' 4”. Hard copies on 8 1/2 X 11 paper will be mailed to you. All plans are designed by Ben Stone. Ben is a retired Engineer in Canada. Ben also drafts these himself using the latest AutoCAD software to ensure accuracy. He studied Engineering back in the early 1980's. After over 30 years in the Construction industry, he developed a passion for building cool items around his farm and cabin. These are great DIY projects. With a little skill anybody can Do It Yourself. Ben is always a email away if you have any questions while building one of his projects. He is adding new plans all the time.