These have been around since 2009 I believe, but this is the first time I've seen or heard about them.
If you're looking for something to use to help protect you and your family, these things look great. You can even use these in the middle of the woods, as long as you can get the water to use to harden them.
Please Note: I am not selling these Concrete Canvas Shelters. Nor do I make any money on this. I just wanted to share this with you.