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Memory Alpha

A subspace surge or subspace energy surge was a subspace phenomenon which could be created by cloaked vessels.

In 2371, the cloaked USS Defiant created a large subspace surge, which was detected by Deep Space 9's security sensors. (DS9: "The Search, Part I")

Later that year, the USS Mekong, carrying Odo and Garak, detected a subspace energy surge when a Romulan warbird decloaked above the runabout. (DS9: "Improbable Cause")

In 2375, Onquanii's ship also produced a subspace surge which could be detected by USS Voyager's sensors. (VOY: "Warhead")

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