subterraneous

Adjective
  1. Being or operating under the surface of the earth (synset 302481859)
    "subterranean passages"; "a subsurface flow of water"
    similar to: subsurface - beneath the surface
    same as: subterranean
  2. Lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed) (synset 301712186)
    "subterranean motives for murder"; "looked too closely for an ulterior purpose in all knowledge"
    similar to: covert - secret or hidden; not openly practiced or engaged in or shown or avowed
    same as: subterranean, ulterior

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