From Russia with love

Good afternoon. I don’t know where to write it therefore I will leave here. There was an idea to make available some types of the base. In the base it is possible to make something like a door, and to hide there valuable things. Plus to make some extents of masking of this door (that is if you want to make I fell imperceptible, it is necessary to spend many resources and with each stage it will be hidden better).
I don’t know how to realize it, simply idea.

Stay away from that trapdoor, 'cos theres something down there.