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In 2373, in an attempt to prevent Dominion reinforcements from arriving through the wormhole, the crew of Deep Space 9 fired a phase-conjugate graviton beam at it in an attempt to collapse its spatial matrix and close it forever. Due to sabotage by a Changeling posing as Doctor Julian Bashir, however, the beam had the exact opposite effect, strengthening the spatial matrix and making it impossible to collapse. (DS9: "In Purgatory's Shadow", "By Inferno's Light")