Memory Alpha
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Memory Alpha

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SC-4 was the designation of a Starfleet Command shuttlecraft used by Admiral Kathryn Janeway of an alternate 2404 in her plan to alter history. Equipping the shuttle with a chrono deflector, Janeway generated a temporal rift to the Delta Quadrant of the year 2378, where she successfully infiltrated the Borg Unicomplex and delivered a neurolytic pathogen to cripple the Collective. This allowed USS Voyager to use a Borg transwarp conduit to return to the Alpha Quadrant sixteen years before they would have without Admiral Janeway's intervention.

SC-4 is presumed destroyed along with the rest of the Borg Unicomplex, though it was never shown on screen.
SC-4 interior

Shuttle cockpit

The shuttle was capable of achieving the speed of warp 6, and it was equipped with deflector shields and several advanced 25th century technologies, including a stealth generator, an ablative armor generator, transphasic torpedoes, and a neural interface and synaptic transceiver. All of which Admiral Janeway shared with the crew of the Voyager in 2378. (VOY: "Endgame")

According to a production sketch of this shuttle by Rick Sternbach and dated 02-01, the SC-4 was an uprated Type-18H shuttle. This type of shuttle was similar to the class 2 shuttle, but more streamlined. It had nanotech molecular armor plating, hot-ready filament phasers, and conformal defense shield grid (embedded). [1]
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