Early in 2012 I built a storm shelter for my family. It's a twelve by twenty concrete block structure designed to be bermed over. Total cost was just over $3,000.
I made a video to walk people through the process; I had never done anything with concrete before this project, so this video is designed to take a beginner and explain everything I had to learn in order to do this. Well, maybe not everything, but a lot - the important stuff. The version of the video here is only the first half. I'm selling the whole video, and plans, etc at my website: www.diystormshelter.com