I used to do some construction work on schools during the summer. The principal wanted, in his closet, a door to slide up where he could keep a safe for special school records, and a mini-fridge. Although it wasn’t very big or that cool, it was the coolest work I ever was involved in that summer. Plus, who wouldn’t want a mini-fridge hidden in their wall?
It was an underground survival bunker accessed through a hidden door in the back of a garage. It had an additional exit by means of an underground tunnel that lead almost 100 feet in the bordering forest. The strangest thing about it was that it was a survival bunker that he had us wire with outlets and lights, despite there not being any type of back-up/off-the-grid power. Makes me think that he actually had an alternative purpose for the shelter.
Yes, we worked on what was supposedly going to be a hidden/secret walk-in safe in the basement. This room was heavily reinforced.
Normally, walls around doors are framed using wood. This doorframe was solid reinforced concrete. The room was a square attached to the outside of the basement, so all four walls were concrete. We poured concrete above it, so the ceiling was concrete. (Very unusual!) We also poured the floor.
So, it was six sides made of concrete. Since it was attached to the outside, there was no sign that it existed from the inside. No ventilation. No wiring from what I saw.
I never saw the finished product, but the owner was keeping it a secret, and wouldn’t explain much about it. So another contractor finished it off.
A friend of our family bought a huge old farmhouse after the couple living in it passed away. They were doing some remodeling and found a hidden door in the back of a closet. It was only a couple feet tall, so you had to crawl through it. It went to a medium sized room with no windows that no one knew about. The only thing in the room was a bed, which would have had to be in there before the walls were put up. It was definitely creepy.
My parent’s house has a “secret” room that’s behind a bookshelf in their master bedroom. The reason I put quotations around “secret” is because this hidden room is wall-to-wall open window.
So basically, you could hide from someone inside of the house, but if they happen to walk around outside, you appear to be in a normal room.