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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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Time Traveler for subsea
The first known use of subsea was in 1817
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