Concealment is everything. When it comes to preparedness concealment is always a great option. Its an even better option when you are talking about your weapons. Our guns are constantly under attack. It seems we cannot go a week without hearing about the latest piece of legislation aimed at our second Amendment. This article on the seamlessly camouflaged hidden floor safe.
Not only is this a great article for creating a in camo safe it also could be expanded upon. The base material is concrete and can be poured into any shape imaginable. This means you could pour a nice underground shelter just below the boards of your floor. The article is not terribly detailed but offers up enough information that you could give this project a go. As a small underground safe this project is incredible. It could hold guns and precious metals.