suboceanic

From sub- +‎ oceanic.

suboceanic (not comparable)

1. Beneath the surface of the ocean.
   • 1984, Dean Koontz, The Servants of Twilight:

     His eyes, like hard bright sea creatures hiding deep under a suboceanic shelf, regarded Charlie with a pure malignant fury...

   • 2007, Pelin Aksoy, Laura DeNardis, Information Technology in Theory:

     Low attenuation translates directly to efficient long-distance communications, such as transatlantic or other suboceanic cable routes...

Borrowed from Italian suboceanico. Equivalent to sub- +‎ oceanic.

suboceanic m or n (feminine singular suboceanică, masculine plural suboceanici, feminine and neuter plural suboceanice)

1. suboceanic