Alternate timeline
(covers information from an alternate timeline)

The machinery of the temporal conduit

Vosk prepares to enter the conduit

The temporal conduit was a device created by the Na'kuhl for the purpose of traveling through time.

A group of Na'kuhl from the 29th century led by Vosk escaped near-defeat in the Temporal War, using a one-way form of stealth time travel, to reach Earth in 1944, in an alternate timeline created by multiple temporal incursions by various factions in the Cold War. There, the Na'kuhl constructed a temporal conduit in New York City in an attempt to return to the future. However, they were forced to use local materials that they secured through an alliance with Nazi Germans.

The primitive technology used made the machine enormous, and the Na'kuhl had difficulty keeping the conduit stable for more than a few seconds. After several failed attempts to operate the temporal conduit, the Na'kuhl were eventually successful, and traveled to the 29th century, igniting the Temporal Cold War into the Temporal War, resulting in the very alternate timeline to which they had originally escaped.

In an effort to stop the Na'kuhl, Daniels sent Captain Archer and Enterprise NX-01 to 1944, where they were able to destroy the conduit before Vosk could enter it. This had the effect of resetting the timeline to its proper form, and bringing an end to the Temporal Cold War. (ENT: "Storm Front", "Storm Front, Part II")

In the final draft script of "Storm Front", the machinery required for the temporal conduit to be opened was described as a "staggering array of technology" and a "mind-bending sight". The script additionally remarked, "It seems to go on for miles."
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