subsea

adjective
sub·​sea | \ˌsəb-ˈsē \
variants: or less commonly sub-sea

Definition of subsea 

1 : existing or occurring below the surface of the sea subsea currents The island, an upthrust of volcanic rock, lies along the Norfolk Ridge, an 1,100-mile line of subsea mountains.— Michael Davie

2 : existing or occurring under the seafloor subsea oil wells

First Known Use of subsea

1817, in the meaning defined above

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The first known use of subsea was in 1817

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