underground
/ˌʌn.dəˈɡɹaʊnd/
located beneath the surface of the earth
“The children discovered an underground tunnel while digging in the yard.”Add to my deck
/ˌʌn.dəˈɡɹaʊnd/
located beneath the surface of the earth
“The children discovered an underground tunnel while digging in the yard.”Add to my deck