noun which may take the genitive case particle 'no', noun
underground; in the ground; subterranean
Refers to something located or happening beneath the surface of the earth. Often used with の to modify nouns.
地中の温度は一年中ほぼ一定だ。
The temperature underground is almost constant throughout the year.
地中に埋められた遺跡が発見された。
Ruins buried underground were discovered.