Constitution class decks

The decks of Constitution-class Federation starship:

Constitution-class deck configuration

A schematic of Constitution-class hull pressure compartments

• Deck 1
  • Bridge (TOS: "The Cage", et al.)

• Deck 2
  • Guest quarters (TOS: "The Enterprise Incident")

In the script of "Court Martial", sections 18Y to 27D of B deck were said to be "near" engineering, though the final version of the episode changes this to refer to someone in sections 18Y to 23D of B deck as "near or in" engineering. The same area of the ship was also referred to as containing the vessel's weapons room, though this statement isn't included in the final edit of the installment.

• Deck 3
  • Engineering (Impulse Deck) (TOS: "Where No Man Has Gone Before")
  • Recreation room 3 (TOS: "Let That Be Your Last Battlefield")
  • Recreation room 6 (TOS: "Charlie X")
  • Crewmen's lounge (TOS: "Let That Be Your Last Battlefield")

• Deck 4
  • The forward edge of the ship (DS9: "Trials and Tribble-ations")
  • Crew quarters (TOS: "The Ultimate Computer")
  • Environmental control (TOS: "The Ultimate Computer")
  • Auxiliary communications juncture (DS9: "Trials and Tribble-ations")

• Deck 5
  • Sickbay (TOS: "Amok Time", "Elaan of Troyius")
  • Engineering (Impulse Deck) (TOS: "The Corbomite Maneuver")
  • Engineering computer room (TAS: "The Time Trap")
  • Transporter room (TOS: "Let That Be Your Last Battlefield")
  • Recreation room (DS9: "Trials and Tribble-ations")
  • Recreation room 3 (TOS: "Let That Be Your Last Battlefield")
  • Captain's quarters (TOS: "Mirror, Mirror", "Journey to Babel", "Elaan of Troyius")

In ultimately unused dialogue from the final draft script of "Charlie X", deck five was said to be the location of Charles Evans' quarters during his time aboard the USS Enterprise, and all the lab circuitry aboard the ship ran through the main corridor on that deck.

• Deck 6
  • Briefing room (TOS: "Return to Tomorrow")
  • Crew quarters (TOS: "The Ultimate Computer")
  • Guest quarters (TOS: "Let That Be Your Last Battlefield")
  • Main life support couplings (TOS: "Day of the Dove")
  • Transporter room (SNW: "Lift Us Where Suffering Cannot Reach")

• Deck 8 (H deck)
  • Auxiliary control (TOS: "I, Mudd")
  • Evaluation laboratory (TOS: "And the Children Shall Lead")
  • Weapons locker (TOS: "The Conscience of the King")

• Deck 9
  • Section 2
    • Crew quarters
      • 3F 125: Spock (TOS: "Amok Time")
      • 3F 127: Leonard McCoy (TOS: "The Man Trap")
    • Life sciences department: Botany section (TOS: "The Man Trap")
    • Atmospheric system (TOS: "The Man Trap")
  • Section 4
    • Briefing room (ENT: "In a Mirror, Darkly, Part II")

• Deck 11
  • Section A3
    • Engineering circuit bay (TOS: "Journey to Babel")

• Deck 12
  • Crew quarters
    • 3C 46: Janice Rand (TOS: "The Enemy Within")
    • 3F 121: James T. Kirk (TOS: "Mudd's Women", "The Conscience of the King", "The Enemy Within")

• Deck 14
  • Transporter room (TOS: "Dagger of the Mind")
  • Engineering support (TOS: "Dagger of the Mind")
  • Section C
    • Personnel director's office (TOS: "Dagger of the Mind")

• Deck 21
  • The habitable aft-end of the ship (DS9: "Trials and Tribble-ations")
  • Power relay (DS9: "Trials and Tribble-ations")

• Deck 22
  • Power transfer conduits (ENT: "In a Mirror, Darkly, Part II")

• Bottom deck:
  • Hatch to satellite bay (TOS: "Operation -- Annihilate!", remastered)
  • Hatch to decontamination tanks spray release (TOS: "Let That Be Your Last Battlefield", remastered)

Appendices

Background information

The following deck layouts come exclusively from the Star Trek Encyclopedia, by Michael Okuda and Denise Okuda.

Deck #	Major features (original configuration)	Deck #	Major features (refit configuration)
1	Bridge	1	Bridge
2	Science labs	2	Science labs
3	Science labs, life support	3	Science labs, environmental support
4	Crew quarters	4	Crew quarters
5	Crew quarters, including Captain's quarters	5	Crew quarters, including Captain's quarters
6	Crew quarters	6	Crew quarters
7	Sickbay, transporter room, briefing room, computer core, impulse engines	7	Sickbay, transporter room, computer core
8	Food preparation, recreation deck, ship's laundry, life support	8	Food preparation, recreation deck, ship's laundry
9	Freight and cargo	9	Freight and cargo
10	Freight and cargo	10	Freight and cargo
11	Phaser controls	11	Phaser controls
12	Interial dampening system, observation deck	12	Interial dampening system, observation deck
13	Observation deck, dorsal interconnects	13	Photon torpedo launcher
14	Engineering support, water storage	14	Engineering support, water storage
15	Deuterium fuel storage	15	Warp drive reaction upper core injectors
16	Deuterium fuel storage	16	Deuterium fuel storage
17	Crew quarters	17	Deuterium fuel storage
18	Power distribution subsystems	18	Main power transformers, sensor subsystems, deflector subsystems
19	Main Engineering, Hangar deck	19	Main Engineering, shuttlebay, navigational deflector, long range sensors
20	Shuttlecraft maintenance	20	Shuttlecraft maintenance, cargo bays 13-18
21	Life support systems, cargo bays	21	Environmental systems, cargo bays 19-20
22	Cargo bays	22	Botanical section, security confinement
23	Antimatter storage pod	23	Tractor beam emitter, antimatter storage pod

The following deck layouts come from The Making of Star Trek, by Stephen Whitfield for the original configuration primary hull and from Mr. Scott's Guide to the Enterprise, by Shane Johnson for the refit configuration.

Deck #	Major features (original configuration primary hull)	Deck #	Major features (refit configuration)
1	Bridge, secondary phaser control	1	Bridge, V.I.P. docking port, emergency batteries
2	Primary research labs, technicians' work areas and duty stations	2	Security chief's office, Temporary holding cells
3	Primary research labs, technicians' work areas and duty stations	3	Kitchen, dining area, V.I.P. (Officers') lounge
4	Crew quarters (junior officers', passenger)	4	V.I.P. quarters, junior officers' quarters, conference room
5	Crew quarters (junior officers', passenger), senior officers' quarters	5	Senior officers' quarters, including Captain's quarters
6	Crew quarters (junior officers', passenger), main engineering	6	Crew quarters, crew mess rooms, crew's lounge, personnel airlocks, gangway hatch, turbolift maintenance, impulse engineering, impulse deflection crystal, fusion reactors
7	Sickbay, water and bulk storage, main computer core	7	Auxiliary control, sickbay, transporter rooms, briefing room, armory, rec deck, bowling alley and racquet ball facilities, chapel, cargo storage, life support, water tanks, battery systems, waste recovery, saucer section landing struts, main brig, gymnasium.
8	Recreation area (outdoor simulation), holographic entertainment center, main mechanical food preparation, laundry, main computer core (lower part)	8	Main docking ports, explosive bolts for separation, planetfall ramp, auxiliary fire control, laundry, fabrication facility
9	Cargo and freight storage, technicians' repair shops	9	Viewing lounges, specialized passanger cabin
10	Cargo and freight storage, technicians' repair shops	10	Primary hull circuit breaker room, specialized passanger cabin
11	Primary phaser control facility	11	Main sensor array monitoring station, specialized passanger cabin
12		12	Photon torpedo storage, torpedo exhaust system
13		13	Photon torpedo room, torpedo tubes, docking ports, auxiliary torpedo fire control
14		14	Engineering computer monitoring room and bay
15		15	Main engineering, horizontal intermix chamber, dilithium reactor room, landing bay control room
16		16	Power converters (M/ARAs), secondary hull main battery room, Chief engineer's office, briefing room, primary maintenance, turbolift repair, landing bay observation galleries, landing bay tractor beam
17		17	Emergency transporters, circuit breaker room, cargo storage inspection balcony, docking ports, landing bay.
18		18	Cargo storage, secondary hull auxiliary control, shuttlecraft hangar, lifeboats
19		19	Cargo storage, cargo transporters, shuttlecraft maintenance
20		20	Matter/antimatter storage, botanical garden and lab, regulation pool sun deck, tractor beam housing
21		21	Matter/antimatter storage (lower part), tractor beam, waste recovery, water tanks, swimming pool

There is a discrepancy in The Making of Star Trek with the description of the primary hull as being eleven decks in height, but shown to be nine decks in height in a cutaway diagram. The secondary hull is stated to be sixteen decks in height, but shown in the diagram to be eight decks, with no exact locations given for the following features: fuel storage, supplies storage, main repair centers, water and waste reconversion, minimal quarters for engineers and star-drive personnel used only in the case of saucer separation and the hangar deck.

Constitution-class schematics created by Doug Drexler for ENT: "In a Mirror, Darkly, Part II"

The most recent canonical cutaway graphic of the original Constitution-class was featured in ENT: "In a Mirror, Darkly, Part II". The graphic was originally produced by Doug Drexler for the Star Trek: Captain's Chair CD-ROM. [1]^(X) It was also featured in the The official STAR TREK prop and costume auction catalog, pp. 36-37. [2] In this image several key locations of the interior of the ship are recognizable as depictions, some are marked and labeled. The schematic depicts the ship as having 27 decks, and one more above deck 1 in the nacelles. The marked areas in this layout are:

Deck #	Major features (original configuration)
1	Main bridge
2	Stellar cartography (upper part), forward phasers t/b, field impeller (in the nacelles, behind the bussard ramscoops) and the warp coils (eight coils in each nacelle)
3	Stellar cartography (lower part)
5	Crew quarters
6	Turbo shaft (horizontal), impulse deck (upper part)
7	Sickbay, transporter rooms, briefing room, the impulse deck (lower part)
8	Arboretums
9	Cargo bays (saucer section, upper part)
10	Cargo bays (saucer section, lower part)
11	Forward phasers
12	Planetary / perimeter sensor dome t/b (saucer section)
18	Auxiliary control, small craft ops (above hangar door), power transfer conduits (four conduits run through each pylon)
19	Shuttle bay (upper part), Main engineering (upper part)
20	Shuttle bay (mid part), Main engineering (mid part)
21	Deflector / long range sensor, main engineering (lower part), Shuttle bay (hangar deck)
22	Aft phasers (below hangar door)
23	Warp core (horizontal)
25	Cargo bays (upper part)
26	Cargo bays (lower part)

Related topic

• Constitution-class sets