Pressure sensor alarm / security system
One thing I have thought about recently:
Many types of alarms are based on detecting movement. This one is not!
It’s very simple and effective. Just seal the “gold room” air-tight, and let the pressure inside be lower or higher than the outside air pressure.
As soon as a door/ventilation/window/mouse hole gets opened, the pressure sensors get triggered.
It’s that simple!
Not all inventions need to be complex to work 