By any standard of measurement, Deep Space 12 is an extremely large free flying orbit station irrespective of it origins or current custodians. However, it is not the largest artificial structure ever encountered. That honor is already claimed by the Dyson Sphere discovered in the Beta Quadrant. At least three major Starfleet starbases dwarf Deep Space 12 in a sheer size and mass, but the former Cardassian station is one of the largest space bone materials refining facility known to date.
The shape descriptors filed with Starfleet's Technology Assessment Directorate classify Deep Space 12 as a Hybrid Planar Columnar Triradial structure. Its basic form is that of a set of nested flattened rings built out from a vertical stepped cylinder core. Emerging above and below the ring plane are three tall pylons with wide buttresses and inwardly sweeping curves. As with most space structures, each shape on the original Nor Class has been designed to perform a particular function. It must be pointed out that varying artistic and industrial engineering styles aboard in the galaxy, and there is no doubt that the functionality of the hardware has been melded together with a stylistic sense that appears to govern the Cardassians as builders.
The massive assemblage of steels and composites can be broken down conceptually into a number of logical components. In 2346, the core assemblies supported the control, scientific, maintenance, recreational, computing, and power generated areas of the station. The Habitat Ring housed the station's Cardassian masters. The Docking Ring provided cargo movement and storage spaces. The Docking Pylons processed raw materials into refined ones, contributing to the Cardassian economic base. The current form is different mainly in the way the station is used by its residents; the Habitat Ring is populated by a wider variety of cultures, the Promenade supports a larger number of merchants and visitors, and the pylons no longer process uridium ore using the labor of the Bajoran people.
At one time in the design process, the pylons were turned to sweep outwards to better accommodate the movement of large number of freighter vessels. The orientation was reversed when it was deemed a better move to keep all station appendages within a smaller, more powerful defensive shield envelope. Docked vessels as well as ships suspended within the shield envelope can be protected. Ships within the shield volume can hold position with active thrusters set to station keeping or can be secured by tractor beam.
The basic dimensions of the station have been determined from auto geometer scans taken off station Starfleet ships and corrected for EM scattering and subspace scan frequency drift. The scans revealed a curious shape anomaly present in all three ring structures. Three apparently random points on each ring exhibit a subtle deformation, either inboard or out board, by an average of 0.47 meters. While not yet explained by space shock, impact, internal pressure, or thermal imbalance, the deformations do not seem to have an adverse effect on the station structure.

Starfleet Command maintains all physical transport and communications ties to Deep Space 12 through channels leading back to the Federation Council in San Francisco and the UFP presidents office in Paris on Earth. The various directorates at Starfleet Command receive mandates from the Federation Council, clearing them to allocate ships, personnel, and cargo. Availabilities of required equipment and consumables are determined, and all cargoes are moved by starship from Earth and other UFP member systems to staging areas such as Starbase 375. Final clearance to traverse the last leg of the run must be given by a Starbase, once the defensive situation at Deep Space 12 is understood. Dedicated personnel transportation is handled in a similar fashion, with or without escort vessels, depending on the priority of the transfer. Specialized high-warp courier vehicles can be employed for critical missions and are able to cover the 50+ lightyear distance between the station and the UFP inner perimeter within six days. This is equivalent to warp 9.92, and is accomplished by using alternating twin matter-antimatter reaction cores and nacelle pairs. A modified four engine version of the Defiant pathfinder spaceframe has proven successful in surpassing the 1,000 lightyear/year efficiency barrier.
Communications between Deep Space 12 and Starfleet relating to support operations pass along an adaptable subspace relay network, as do all vital computer, voice, and visual data streams. All real time calls and formal requests are logged with Starfleet Command on Earth, and the response time of the call will be handled according to urgency of need. Emergency evacuations, for example, will be in work by a nearby Starbase before the original message reaches the UFP. More routine resupply orders will be processed by the Material Supply Command spacecraft are handled by a joint tasking group within Starfleet Command and the Federation Council.
Shipments of Starfleet originated equipment and consumables are made in standard cargo containers and involve instrumentation, breathing gases, potable fluids, and single starship runs are common transfer methods. High security items, such as weapons systems and power packs, arrive at the station by both open and covert means.

Vitally important to the reconstruction for Deep Space 12 was the Starfleet Corps of Engineers (SFCE), which also handles any required modifications and maintenance involving large scale structures and hardware systems. An average of thirty five resident engineers and technicians are based at the station, and are overseen by the chief of operations. An affiliate group of twenty eight Bajoran engineer work together with the Starfleet crews and have been trained to maintain the station in the absence of Starfleet personnel. Engineering equipment assistance is provided in the form of tools, spares, replication gear, computer databases, and heavy equipment manipulation booms and extravehicular activity (EVA) systems. This last area involves interior and exterior spacesuit operations, and Work Bee autonomous cargo and repair pod missions.
The SFCE crews have been instrumental in many episodes of station repair. Computer templates of the pylon structure and internal systems were used by the engineering crews to form new components, and seamless meld framing and hull plating together, once the damaged materials had been cut down and prepared. Every instance of threat weapons fire that has penetrated the station defensive shield envelope must be analyzed by SFCE and Bajoran personnel for microfracturing and alloy destabilization. Full patching and rebuilding are performed if required. The crews are also responsible for monitoring the total station structure for tension, compression, as well as radiation effects from all known EM and subspace sources. Unique energetic effects not already stored in the structural database are added whenever encountered, in order to create new repair protocols.



Approximately 3.65 teraquads of data on the construction of Deep Space 12 has been compiled by Starfleet Command, based on intelligence reports, Cardassian computer file reconstruction and decryptions, and surviving Bajoran records of the occupation. Not all of the data can be reconciled, though enough have been pieced together to present a reasonable understanding of the sequence in which the station was constructed. A total construction time has been documented as 2.7 standard years.
It is known that not all of the station construction materials originated in the Bajor system. It is estimated that fully 30% of the central core framing was machined from asteroidal materials in the Cardassian system and moved across several light-years into its preset location by Cardassian freighters for assembly. During that time, the surface facilities on Bajor began fabricating hull plating, power conduits, fusion generator components, and internal utilities equipment. The entire Ops module was also brought to the area as a single prefabricated assembly from Cardassia Prime. It is believed that the high energy alloy furnaces available on Bajor early 2343 were not adequate for some of the critical structures and were subsequently upgraded and in some cases replaced, all at great cost to Bajor in resources and personnel.

The sequence of assembly for the major station sections proceeded as follows:

• Assembly 1: Mid-Core. Framing members for the Mid-Core were delivered by freighter and gamma welded. Computer cores, deuterium fuel tanks, and minimal life-support systems installed to create initial habitable spaces. Temporary command center established at dorsal of Mid Core. Hull plating begun after completion of Lower Core framing.
• Assembly 2: Lower Core. Framing arrived from Cardassia Prime and Bajor; gamma welding continued on framing and hull plating. Lower Core internal workspaces, residences, and utilities gear installed. Section prepared for addition of fusion generators.
• Assembly 3: Upper Core. Framing and hull plating shipped up from Bajor and assembled. Temporary command center transferred from Mid Core and docked to Upper Core. All Upper Core workspaces and systems equipment installed.
• Assembly 4: Fusion Generator. Upper shell of generator housing framed and plated; fusion reactors installed. Lower shell framed and plated. Carbon composite thermal blocks and sodium exhaust cone installed.
• Assembly 5: Promenade and Security Corridor. Temporary command center dismantled to allow for Promenade framing and hull plating. Reactive shield armor installed. Complete station atmospheric pressure integrity established. All remaining core systems installed.
• Assembly 6: Ops. Permanent Cardassian command center (now Ops) docked to structural core; gamma welded. Turbolift connections established. Defensive shield generators and emitters installed.
• Assembly 7: Habitat Ring. Framing and plating shipped from Bajor and assembled. Minor crossover bridges and horizontal turbolift paths established. Weapon sails fabricated in nearby orbit and attached.
• Assembly 8: Docking Ring and Pylons. Large crossover bridges framed and plated. Turbolift and cargo paths established. Pylons erected from crossovers prior to Docking Ring framing. Ore refining equipment installed in pylons. Pylon docking ports installed. Docking Ring framed and plated. All remaining systems installed.

Starfleet Command, working with the Bajoran provisional government, moved quickly to add equipment and personnel to the new outpost. Their overall job was to adapt the existing systems to work with familiar Federation technology. Heading the tasking list was the priority assignment to add much needed defensive hardware to protect the station from threat force attack, namely the retreating Cardassians. Nearly all station systems required some degree of power, atmospheric, or duotronic translation or conversation. Those systems deemed acceptable in pure Cardassian form were initially left unchanged.

The Cardassian systems that underwent the greatest modifications include the following:
• EPS power System. All interfaces to Starfleet devices were configured with step up plasma phase inverters, EPS level limiters, and variable auto-input controllers. Not all of these power conditioning measures were effective at first, but subsequent repairs and upgrades have brought station operations up to an acceptable level of reliability.
• Atmospheric Handling Systems. By and large, the Cardassians maintained a living environment that was too hot and too dry as compared to that deemed comfortable by other humanoid species. Starfleet and Bajoran engineers reconfigured the environmental control systems for the station's common areas to produce twenty two degrees Celsius and 18 percent humidity conditions, and left the remaining controls in private residences and secure work areas to be regulated by individual users.
• Computer Systems. As in the case of the power conversions, the onboard isolinear based computer systems required a complex set of adaptive interface devices to work with Starfleet systems and programming. In most cases, the Cardassian computer control circuitry that maintained the station on a basic level worked without translation, provided the operators understood the Cardassian language, 243-bit programming code, and how the equipment functioned. While the majority of the computer controlled systems were not sabotaged, enough hazardous security devices, deeply buried programs, and computer viruses were left to warrant staying on guard against continued dangers.
• Weapons Systems. Large-scale Starfleet shield energy generators were installed as backups for the existing defensive shield system. These generators could produce a variety of field and particle types and were interfaced with the Cardassian systems via redundant step up EPS couplings. New phaser emitters were installed into the existing weapon sail towers, as were magazines and launchers for standard photon torpedoes. Rotary phaser and torpedo launchers were subsequently installed in spaces once used as monitoring and observation facilities.
• Spacecraft Docks and Repair Bays. Since not all starships operating in the galaxy conform to all docking ports, modifications had to be made to many of the berthing facilities on Deep Space 12 to accept Starfleet hatch fittings. The most extensive work was done on the six pylon docking ports, three large Docking Ring ports, and the new runabout launch bays. The runabouts required six large volumes cut into the Habitat ring to accommodate the pressurized bays and electrohydraulic pads.
• Communications Systems. New subspace radio transceiver assemblies and Ops mounted antennae were installed to provide secure voice and data communications between Deep Space 12 and neighboring star systems, starships, and Starfleet Command. Numerous intrastation transceivers were also installed, either interfaced with Cardassian components or bypassing them to talk directly to Starfleet systems.