subterranean

/sʌbtɝˈeɪniʌn/

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Definitions

Adjective Satellite
being or operating under the surface of the earth; "subterranean passages"; "a subsurface flow of water"
Adjective Satellite
lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed); "subterranean motives for murder"; "looked too closely for an ulterior purpose in all knowledge"- Bertrand Russell