UEO Poseidon class Subcarrier

Poseidon class Fleet Carrier (SCVN)

Marine Dynamics Ltd.

Estimated Construction Cost:
Approximately 9 billion USD per unit

Keel Laid:
Poseidon SCVN-40 2029

Poseidon SCVN-40 2030

Poseidon SCVN-40 2031

Length: 205.0m (410.10 feet)
Beam: 53.0m (173.9 feet)
Height: 40.0m (131.2 feet)

Submerged Displacement:
31,060 tonnes

Hull Composition:
Double layered semi-organic pliant self-regenerating 3rd Generation Bioskin covering a titanium double hull supported by a reinforced composite steel frame

Bioskin details:
Anechoic, genetic hullskin developed as an acoustics countermeasure. The genetically-engineered material - a living organism by any other definition - covers the exterior of the hull as two layers, each approximately three and a half inches thick. Both layers are highly tensile, densely composed structures which absorb and distort active acoustic signals such as sonar pings, thereby drastically reducing the effectiveness of sonar equipment directed at the vessel.

Secondly, the bioskin attenuates sounds emitted from the submarine - especially from engine machinery. This substantially reduces the passive sonar visibility of the submarine, rendering it effectively completely stealth to passive detection at extended ranges.

Thirdly, the bioskin possesses self-regenerating properties that enable it to seal any external breaches to the pressure hull. Being a third-generation skin, the enhanced genetic properties allow a rate of regeneration which can completely seal a compromising hull-breach up to 50 feet wide in just less than 30 minutes, allowing the internal compartments to be isolated, sealed and then siphoned of water to allow extensive internal repairs to otherwise crippling damage without the need for a drydock or harbour facility.

The genetic composition of the hull skin is one of the most classified and tightly controlled secrets in the UEO Navy's bioengineering corps. The degree of effectiveness of the technology is unparalleled by any other navy in the world, and it is reported that the technology has helped in reducing the sonar signature of UEO submarines by up to 85 or 90 percent.

Crush Depth:
Greater than 10,000 feet.

1 Lockheed Naval Systems Tokamak fusion reactor powering 6 aqua-return propulsion drives

Maximum: 130.7 knots
Standard Cruising: 90-95 knots

Computer System:
IBM VII-C Neural Network

Computer Specifics
The IBM-VII series neural cores have been in operation aboard UEO submarines since the early 2030's. The VII-C installed aboard Poseidon class carriers has been deployed since 2035, and replaced the VII-A originally installed during the class's earliest production run. Operating with a fully-integrated Linux-based OS developed specifically to the class's specifactions, the system is believed to be up to 10 times more effective than the latest generation fiber-optic systems used in the civilian market.

The information systems are wired throughout the ship in bundled bio-gel conduits. Each 'bundle' consists of several thousand 'strands' of artificially manufactured 'nerve' wiring that is stimulated and insulated by the gel within the conduits. The computer core memory banks have a capacity in the area of nearly 1 petabyte of information storage (1 Petabyte equals approximately 1 million gigabytes)

The primary difference between the type VII-B carried aboard the near-identical sister-class, the Defiance, and type VII-C cores aboard the Poseidons is one of design purpose. The Defiance's computer systems are dedicated to high-sensitivity and long-range weapons control, while the Poseidon's computer systems deal more with long-range communications to deployed subfighter wings. As weapons sensors and communications systems are similar in design, the differences between the two cores are subtle on most levels of operation.

Neural network technology is controlled by the UEO's bioengineering corps; a division of the Military Science Bureau.

Internal: Hypersonar; active and passive sensor suites
Effective Range: Approximately 100 nautical miles

Hypersonar technology relies on a combination of 'traditional' acoustic monitoring equipment such as active and passive sonar, and laser-based range finding, it stands for Hypersonic Navigation and Ranging; as the name implies, it uses faster-than-sound technology to detect shipping, map terrain and aid in navigation. The Poseidon class mounts a total of 5 parabolic hypersonar arrays mounted bow, stern, midships dorsal and ventral across the submarine providing it with 360 degree sonar coverage on all of its axis.

Operating passively, hypersonar sensors are able to work in conjunction with the ship's computer to use repeated, low-band particle beams to build up a 3D picture of the environment while an integrated passive array intelligently detects and identifies acoustic signatures within that environment. This is the preferred method of operation, as it maintains complete stealth capability for the submarine while still providing at least a marginal picture of the environment around the vessel - while there is no guarantee that a submarine will be detected by the passive components of the array, the laser array ensures that even if targets cannot be identified, they will be detected, ranged and targetted. Only next-generation active camouflage systems employed by Macronesian vessels have the capacity to evade passive hypersonar entirely.

Used actively, hypersonar becomes a double edged, but ultimately infallible sword - First sweeping the area with a high-sensitivity laser array to gather preliminary data, the ship's computer then isolates targets of opportunity which are then battered with a series of uni-directional audio pings, the system literally bounces sound waves off specific solid objects in the water repeatedly and reflects them back to the array, with each ping building up an incredibly detailed picture of the target in real time. The only draw back to this system is that the target being 'illuminated' will also have access to the same information - active acoustics work both ways.
Nonetheless, the system is a marked improvement over first-generation active sonar technology used throughout the later part of the 20th century where a single ping could be detected by any submarine in the area. The new directed-array used in hypersonars will limit the 'saturation' of the ping to one specific vector, thus maintaining the submarine's stealth against any other target in the area. Only a sophisticated inter-ship battle network (Such as the encrypted, globe-spanning communications system used by the UEO military) would be able to make use of another ship's sensor information in real time, and forces which do posess such communications ability are very rare; most certainly, the Battlenet has been one of the UEO's major advantages over the Macronesian navy's own (and significantly less advanced) command and control network.

Combining active hypersonar on a single ship with such a network between a taskforce would enable an entire battlegroup to receive real-time and incredibly detailed target information without revealing their locations.

8 21-inch torpedo tubes (mounted bows)
6 SLR-83 "Avenger" Long Range Plasma Pulse Particle Lasers (mounted bows, midships)

Defensive Systems:
Mark IX and X Intercept Torpedoes
ECM Packages and Noise Makers

As a carrier, the Poseidon's armament is modest at best. Having stripped many of its torpedo and laser weaponry (Laser batteries require massive amounts of space for heat sinks and generators) in its role as a dedicated carrier, the Poseidon carries only half the armament of its cruiser sister, the Defiance. The Poseidon's eight 21-inch torpedo tubes are rapid, self-loading batteries which can be fired, flooded, drained, reloaded and fired again in approximately 5 seconds. They are capable of delivering every UEO torpedo model developed since 2019 with current armaments including the Marks 87, 88, 91 and 92 variable-charge plasma torpedoes and the Marks IX and X Intercept-countermeasure torpedoes.
The ship's magazines can be stocked with a total of 80 21-inch torpedo warheads. The rest of the enlarged-magazines of this class are used as storage for subfighter armament.

Like the Defiance, the laser armament is a relatively new feature of the class, having been installed in a series of refits in the late 2030s as an answer to fast-moving, mobile Alliance subfighter units. The weapons are mounted in space that would normally be occupied by torpedo batteries aboard a Defiance, and are the last line of defence for an otherwise under-gunned submarine of this size. The principal striking power of the Poseidon is its sea wing of Raptor and Stormhawk class subfighters.

EVA Assets:
Can carry up to 60 sub-craft of various types. During peace time, this is generally halved between utility/science craft and combat subfighters. Following the opening of hostilities with Macronesia, most of the hangar is given over to as many combat craft as possible. This includes Spectre and Raptor class subfighters and Stormhawk class Bombers.


The Poseidon class was the first dedicated fleet carrier to be built for the UEO Navy. Following the sucess of small strikecraft deployed aboard the seaQuest class and now-decomissioned Titan class large SSNs, the UEO Navy felt the need to deploy larger, dedicated carriers to counter the threat of Macronesia's extensive subfighter corps. As of 2032 - the year of the UEO Poseidon SCVN-40's commissioning, the Alliance outnumbered the UEO 4 to 1 in subfighters, and the presence of several of these carriers by the end of the year would come as a welcome addition to the fleet.

The Poseidon was the first submarine capable of carrying and supporting an entire wing of subfighters for extended deployments of up to 6 months or more at a stretch, and was used extensively in the early 2030's as a mobile firebase for UEO fighter operations along the Macronesian border, where raids from Lysander class subcraft were commonplace. Prior to the official declaration of hostilities in November 2040, this class of carrier formed a pivotal backbone in the defence of the UEO's outer-most colonies. Not until 2039 would the UEO have a larger, meaner submarine (Reverence class) that was able to perform the task of the Poseidon while still maintaining a heavy-gun presence for engaging enemies in close-quarters combat. The advent of the Reverence not withstanding, the Poseidon is still capable of carrying just as many fighters as her larger cousin, and the class continues to be built in shipyards around the UEO for their enduring versatility in the fleet, and relatively affordable cost when compared to the Reverence.

Crew Complement:
Ship's company: 190 (Includes 35 officers and 155 crew)
Fighter wing: 210 (includes pilots and ground staff)

Development history and class background...

If you ask any back-water UEO colonist what their greatest fear is from the Macronesian Alliance, he will most likely answer the Aleus class carrier. Fortunately for such colonists, the UEO's capability to combat this threat comes in the form of one of the finest and reliable subfighter carriers the world has known: the Poseidon class.

The Defiance cruiser and Poseidon carrier share a common history; both vessels are based on the same hull design, making them very versatile warships. Despite this, the similarities end there. While their design is nearly identical and they share many basic parts, the Poseidon 's internal layout is vastly different from the Defiance.

The Poseidon was the UEO's first dedicated submarine carrier, and when it was first built, it was more than capable of holding back Macronesia's marauding Lysander squadrons. By the end of 2035, 15 Poseidons were in service with the UEO Navy, and by the outbreak of war at the end of 2040, an additional 17 had joined their ranks. For the 10 years they have been in service, they have been the long arm of the navy's strength, and wherever there is a brewing crisis or trouble stirring, the Poseidons are there to answer the challenge.

One vessel of note is the UEO Reverence which Captain Mark Ainsley (Now of the Atlantis ) commanded from 2030 until 2039. Reverence (SCVN-41) was the second of the Poseidon fleet carriers and remained in service to the UEO fleet continuously for 10 years before being given an early retirement and decommissioning a decision prompted by the carrier's poor condition and push for even heavier carriers such as the even more massive Reverence class. Three of the ships ended their service to the UEO in 2039; the Reverence (decommissioned and scrapped), the Poseidon (Sold to the North Sea Confederation and renamed.) and the Constellation. (Sold to the North Sea Confederation and renamed.)

The name-ship of the UEO's latest class of Battlecruisers was named the Reverence after Ainsley's command.

In 2040, the Poseidon was one of the most important ships in service to the UEO, and operated en-masse as the flagships of many taskforces. By the end of that year and the break out of the Alliance war, they were taking an increasingly active and pivotal role in supporting and deploying the UEO's subfighter forces.

18 of their number saw combat in the April 2041 battle for Pearl Harbor where 4 were lost, (UEO Eisenhower SCVN-51, UEO Ranger SCVN-54, UEO Bunker Hill SCVN-63 and UEO Soryu SCVN-65) and another the famously named UEO Enterprise SCVN-44 was badly damaged.



Copyright 2006-2009 James Ward. All reference pertaining to "seaQuest DSV" and "seaQuest 2032" are copyrights of Universal/Amblin enterainment and no claim is made to these titles. Atlantis DSV and all related themes are copyright of James Ward and associated writers.

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