Beneath the surface of the South China Sea, a silent strategic competition plays out daily — one that most people never see.

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Add Yahoo as a preferred source to see more of our stories on Google. Naval vessel firing missile - Historical/Getty Images Because of the specialized nature of submarines, a distinct military ...

Because of the specialized nature of submarines, a distinct military strategy called anti-submarine warfare, or ASW, was created to counter them. Its primary objective is to defend ships and allied ...