One of my worst fears is walking into my house and looking down the barrel of my hd shotgun in the hands of an intruder. I put a lot of time and effort into designing and building a hidden compartment within a wall. I was really proud of my work.
Then I spoke with a friend who has decades of LEO experience and proudly described my project. He said; "that'll work great if a couple of kids break in, but a pro is going to have a stud finder and he'll find that right away."
Now I'm looking for a safe.