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In '''Starbase 257''' was a [[2374Federation]] [[starbase]], located in the starbase was attacked by a wing of [[Jem'Hadar fighterAlpha Quadrant]]. It is a [https://memory-beta.fandom.com/wiki/Sigma_class Sigma-class base]s, shortly after built to be a strategic outpost. While within its defense perimeter, ships had to remain at one-half impulse until they cleared the outer markers. This starbase was located in relatively close proximity to [[runaboutDeep Space 9]] ''USS Shenandoah'' had left .   The Sigma-class design was based on the station ''en route'' to [https://memory-alphabeta.fandom.com/wiki/Ferenginar FerenginarR1_Invictus_class R1-class space stations]of the 23rd century. The primary hull was cone-shaped, with additional modules attached underneath, and topped by an antenna on top. Its characteristic feature was a ship-sized launch bay leading into the primary hull.That docking bay was used to service, store, and construct starships.  During the Dominion War, in [[2374]], this starbase was attacked by a wing of [[Jem'Hadar fighter]]s.      [[category: starbase]]