podziemnymi
Podziemnymi is a Polish word, the instrumental plural form of "podziemny". This adjective translates to "underground" or "subterranean" in English. It is used to describe anything located beneath the surface of the earth.
The term can refer to various things. For example, it can describe underground infrastructure such as "podziemnymi
In a broader sense, "podziemnymi" can also be used metaphorically to describe clandestine or hidden activities.