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
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