Ok, best guess. That is not carpet, it is a decorative epoxy over concrete. Neither the safe or this heavy object seem to be sinking into carpet.

Maybe we are looking at one side of a divided 3 (or larger) car garage.

On the other side of that wall, we have one of these:

[Linked Image from garageevolution.net]

Probably something far less complicated than that, but I sure as hell can't figure it.

The hole in the 2nd from bottom board doesn't make sense. Perhaps access for an outlet, though it seems to low on the wall for an outlet. And surely anyone going to that kind of trouble could have moved a simple outlet.

Guns are responsible for killing as much as Rosie O'Donnel's fork is responsible for her being FAT.