Deep Space 3 was a Federation Starbase constructed prior to 2290 near the border of the Klingon Empire, with the purpose of keeping an eye on the Breen and other species in Breen space, in the vicinity of the Alpha Quadrant's Black Cluster. (TOS novel: War Dragons; ST reference: Star Charts)

In 2290, the space station was attacked by combined Anjiri and Nykkus forces, resulting in great damage, with the USS Enterprise-A and USS Excelsior taking part in the station's defense. (TOS novel: War Dragons)

By 2370, the station was under the command of Admiral Marcus Holt. In that year, the station hosted the annual palio, wherein the Ferengi were accused of trying to bribe the Breen pilot into throwing the race.

Later that year, the USS Hera, commanded by Captain Silva La Forge, departed Deep Space 3 on a courier mission and disappeared shortly after. (TNG episode: "Interface")

In 2375, Admiral Holt reported making great strides in Federation/Breen relations until the Breen joined the Dominion. (LUG reference: Star Trek: Deep Space Nine Core Game Book)

By 2381, Deep Space 3 was under the command of Commander Gong. DS3 was the location of a field office of the Starfleet Corps of Engineers, directed by Lieutenant Commander Kareem Mussad. Shortly after the Borg Invasion of 2381, Deep Space 3 became a central research facility for "Project Reassimilation", a classified project to study deactivated Borg technology and attempt to adapt it for Starfleet use. (ST novel: A Singular Destiny)

Deep Space 3 is mentioned in Max Grodénchik's "Rom's Song", as the station where Odo moves to.
Federation starbases
Starbases 1234567891011121314151617181920212223242525-Alpha26272829303132333435363739-Sierra404142434445464747-Vanguard48495051525355565859616263646566676869717273747576778081828384858687888990919293959697991021031041051061081091121131141171181201211221231271291331341371521531571621721731741761781791801821851891931972002012092102112122142152182192202232272312342352362372472522572602612622632682772953013033073103113123133143153243253263273283363433443473573643713753834014104114124134144164194204224344404524734954995055145155215235245285415856126216236937147188048238344077Battle Group 1Battle Group 2Battle Group 3Battle Group 4Battle Group 5Battle Group 6Battle Group 7Battle Group 8BravoCopernicusDiamandis 1EarhartFleet Setup StationG-6HelaspontIcarusIndiaIridaniLeonovMagellanMI-17MidwayMontgomeryNeil Armstrong UFP seal Starfleet Command logo
Kelvin timeline Starbase 1Starbase 76Starbase 82Starbase 91Yorktown Station
Deep Space Stations 123456789 (I)9 (II)1012C-15E-5G-6HubbleK-2K-5K-7K-8K-10K-11K-12K-13K-22KR-1KR-3L-6M-20M-33R-5Portal 1
Kelvin timeline K-5K-7K-4K-11

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