subsurface

[suhb-sur-fuhs, suhb-sur-]
adjective
below the surface, especially of a body of water.

Origin:
1770–80; sub- + surface

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Unseen is the subsurface irrigation system, which is regulated by a high-tech
  on-site weather station.
The results will help researchers glean information about the mountain's
  subsurface structures.
Ground-penetrating radar bounces back images revealing subsurface objects or
  disturbances.
Sea otters, which eat clams buried underground, are particularly affected by
  the subsurface oil.
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