Which preposition to use with subsoil

in Occurrences 4%

Its appetite for extermination extended to the poor and to the obscure, its anger and animosity penetrated as far as the lowest class; it created fissures in the social subsoil in order to diffuse the proscription there; the local triumvirates, nicknamed "mixed mixtures," served it for that.

of Occurrences 1%

the shattered wall, the soil and subsoil of the garden flew.

to Occurrences 1%

To overthrow that dictatorship was the work I had volunteered to do, and in doing it, my plan was to "plow deep," subsoil to the beam.

Which preposition to use with  subsoil