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A subsurface ocean current is an oceanic current that runs beneath surface currents.[1] Examples include the Equatorial Undercurrents of the Pacific, Atlantic, and Indian Oceans, the California Undercurrent,[2] and the Agulhas Undercurrent,[3] the deep thermohaline circulation in the Atlantic, and bottom gravity currents near Antarctica. The forcing mechanisms vary for these different types of subsurface currents.