located, carried on, or used under the surface of the sea: undersea life.

1605–15; under- + sea

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World English Dictionary
undersea (ˈʌndəˌsiː)
adj, —adv
below the surface of the sea

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
His undersea creatures line up in four rows of four and then dip and rise in
  canon: the waves of the sea.
There was a sense of star charts and galaxies, undersea worlds.
The new undersea cables aren't being driven by a need for more capacity, but
  rather to reduce latency in the network.
Once the marvel of the telecom world, the first undersea fiber optic cables
  have reached the point of telecom obsolescence.
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