- For other uses, see Deimos.
The Deimos class[5] was a 23rd century Federation starship, a stealth[2] mothership[3] in Starfleet's covert ops organization Section 31 service in the 2250s decade. (DSC episode: "Such Sweet Sorrow")
History and specifications[]
Technical specifications[]
In the 2250s decade, capital Section 31 stealth ships shared a design lineage that was based on the smaller intel science destroyer. Apart from a size difference, the S31 ship classes shared the design for warp nacelles, nacelle pylons, bridge module and deflector dish.
Additionally, four capital ships shared the same arrowhead-shaped saucer section with a characteristic negative space between bridge and bow. The hull material was typically black.
The standard configuration of the Deimos class consisted of a saucer section placed directly atop a tall, narrow secondary hull. The secondary hull flared into a triangular section that held the upward-facing pair of nacelle pylons and warp nacelles.
The bussard collectors and warp plasma in the nacelles were of the same shade of blue. All windows were blue and could be switched to white light, while the bridge dome remained white.
Rear-facing red impulse engines were attached to the saucer section and the aft end of the secondary hull. The shuttlebay was located at the aft end.
The Deimos-class starship's overall length was 872 meters
The orientation of the nacelles, resting on one side, matched the orientation of the smaller intel science destroyer.

Nimrod-class mothership.
The ship's widest points were either side of the saucer, measuring 401 meters from port to starboard. The total height of the Deimos was 109 meters. A variant of the design was the Nimrod-class, which carried an extra set of nacelles.
When the Deimos entered a cloak-like stealth mode called "dark mode", the pylons and nacelles folded inward, making the ship smaller. In dark mode, light sources were also eliminated. (DSC Issue 32: "Section 31 Hou-Yi-class")
A key tactical advantage was the ability to deploy scores of Section 31 drone swarms that normally filled the skeletal saucer section wings on either side of the central spine. They were unpiloted craft armed with phasers. (DSC episode: "Such Sweet Sorrow, Part 2")
Service history and disposition[]

A Deimos-class ship in flight.
In the 2250s decade, the secretive Federation intelligence branch Section 31 operated a fleet that included Deimos-class motherships. They could deploy Section 31 drone ships in a swarm. (DSC Issue 32: "Section 31 Hou-Yi -class")
In the year 2257, the artificial intelligence Control assimilated Captain Leland and assumed command over the entire Section 31 fleet.
At the Battle near Xahea in 2258[6], Control's fleet engaged the USS Discovery and USS Enterprise in combat in a bid to seize the Sphere data. (DSC episode: "Such Sweet Sorrow")
Control, in the body of Leland, was temporarily defeated and its fleet destroyed. The Discovery was guided by the Red Angel through a rift into the 32nd century. (DSC episode: "Such Sweet Sorrow, Part 2")

In the 24th century, Daystrom A500 androids, known as Synths, operated Deimos-class Synth frigates to support their work. This new class bore resemblance to the Section 31 drone ships. (STO website: House Shattered: Join the Synth Wave!)
Known ships[]
- unnamed Section 31 starships:
- Control's fleet at Xahea (2258)
Appendices[]
Connections[]
Starship classes of Section 31 | ||
---|---|---|
By name | Constellation • Deimos • Dreadnought • Hou-Yi • Miranda • Nimrod • Shiva • Turing • Vengeance | ![]() |
By type | command heavy battlecruiser • dreadnought • drone • hybrid drone ship • intel dreadnought cruiser • intel science destroyer • scout ship | |
Unnamed | crescent-shaped starship |
Appearances and references[]
Appearances[]
- DSC episode: "Such Sweet Sorrow" (first appearance)
- DSC episode: "Such Sweet Sorrow, Part 2"
- DSC Issue 32: "Section 31 Hou-Yi-class" (Section 31 fleet breakdown)
- STU Issue 01: "La Sirena", promo image (class name established)
- STU Issue 09: "Section 31 Deimos-class"
References[]
External link[]
- Deimos class (Section 31) article at Memory Alpha, the wiki for canon Star Trek.