China’s Clandestine Submarine Caves Extend Xi’s Naval Reach

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Beneath the surface of the South China Sea off the tropical Chinese resort island of Hainan, an underwater tunnel guides submarines into a lair reminiscent of a James Bond spy movie.

From this pen the subs can venture in and out of the contested South China Sea hidden from the prying eyes of reconnaissance planes deployed by the U.S. Navy, which for the past half century has enjoyed almost unfettered access to the waters, say military watchers who cite satellite images of the area.