The Pedestrian Infrastructure makes up the habitable interior of a TARDIS's internal quasi-dimensional continuum. The Infrastructure is composed of a complex web of bio-mathematics and exitonics with a finite multidimensional mass, which usually totals about 68 thousand metric tonnes. Every TARDIS comes with a default tangential formation which determines the location and floor plan of its power and storage rooms. This formation is always organized according to a specific geometry, which can be followed if you understand the pattern.
All TARDIS have a core known as a Time Sceptre. This central structure is made up of the Control Room Sphere, Core Service Module, Artron Mainframe, Transpower System, and the Eye of Harmony Sphere. Each segment is an independent micro universe whose size depends upon the requirements of the systems it contains.
The tower of the Time Sceptre is enclosed in a spherical chamber that is several miles in diameter. This chamber (or endo-shell) marks the limits of the quasi-dimensional continuum that is the TARDIS's micro-universe. This spherical chamber is covered with numerous pods connected by rods. These are the extra store rooms and corridors.
The operator can exert direct control of the interior architecture, and some operators choose to alter this tangential formation, designing things as they see fit. Despite the fact that all the rooms are physically organized into a Time Sceptre and pods on the outer chamber, dimensional junctures (aka space-time bridges) allow the operator to effectively lay out the pedestrian infrastructure as he sees fit.
The Power and Storage Rooms of a TARDIS are accessed (using dimensional junctures) via service tunnels (aka corridors), galleries, walkways, stairways, escalators, and lifts. Using Dimensional Junctures the rooms don't even have to be connected in any logical or mappable fashion. Multiple doorways can lead to the same room, and a single doorway can lead to two different places depending on which way you walk through it. Some frown on these sorts of configurations and believe that a properly stabilized Pedestrian Infrastructure should be able to be easily mapped in three dimensions. Temporal Locks are another way to customize the architecture. They can be used to separate part of the TARDIS interior, such as a Storage Room. Temporal Locks can even be used to connect that room to Normal Space via a Real World Interface. Once set up, a Temporal Locks is activated or deactivated by pressing the three green light-up buttons found inside the room in question.
The interior of the Pedestrian Infrastructure appears to be fairly standardized for even the most eccentric TARDIS and operator, such that any Time Lord will be able to find their way around with minimum difficulty. A fully functional TARDIS will guide lost crew members to their destination using glowing arrows on the walls. For a variety of reasons the interior layout of a TARDIS often changes slightly over time. For more information see Architectural Configuration Program . By the end of the Time War some Time Lords will have upgraded their TARDIS architecture to make sure the room they need comes to them.
Using Dimensional Junctures the interior is organized by level, sector, tunnel, and room number. Corridors (aka service tunnels) are classified by a colour and a number code (e.g. Blue Section 2-5). Rooms are catalogued with a number and a letter (e.g., 23A, 23B). The letter might indicate which level the room is on. There are at least 12 levels which can be reached with stairs, escalators, or lifts. The Lift Shafts have ladders mounted on them. The interior of the shaft sometimes looks identical to the corridors only vertical. Rooms are classified as either Power Rooms or Store Rooms. A TARDIS has a total of fifteen Power Rooms that contain all of the machinery that powers and operates the ship. They are located deep in a TARDIS's interior and serve as the "nerve centre" of the capsule. The following power rooms are known: The Cloister Room, Power Stacks Room, Dynamorphic Power Station, Ancillary Power Station, Protyon Unit, Life Support Systems, Internal Scanner Room, Fault Locator Room, the Primary Control Room, the Secondary Control Room, The Tertiary Control Room. There are also several Control Relay Rooms which look like smaller versions of the Secondary Control Room.
Aside from these 15 power rooms and the 3 Control Rooms, all rooms are classified as Store Rooms, and these make up the bulk of the Pedestrian Infrastructure. A Standard TARDIS includes bedrooms, bathrooms, maintenance bays, and research labs. With the exception of the Basic Crew Facilities, all storerooms are located in pods around the outer surface of the spherical micro-universe A standard TARDIS has a million Store Rooms and at least 12 levels. On average there is a room for every 3 meters of corridor or service tunnel. The total volume of rooms and corridors in a complete Type 40 TARDIS has been described as being about the size of a small town. It's also been described at being at least twice the size of San Francisco's Chinatown at the beginning of the 21st century. This means that the volume of the Pedestrian Infrastructure is between 13,000,000 and 60,000,000 cubic meters. A fully guided tour of a Type 40 TARDIS could take a couple of years. Regardless of how the lifts and stairs are configured, as one gets closer to the Cloister Room, he will feel as if he is descending deeper and deeper into the TARDIS. This is because the Cloister Room is located at the bottom of the Time Sceptre.
Matter used to create the rooms and service tunnels is created using Block-Transfer Mathematics and has enhanced temporal properties. This also makes it resistant to being retro-annulled and immune to the normal Vortex energies. During the Time War the matter used for the internal structure of a TARDIS was capable of withstanding a full-on thermonuclear blast. Aside from the Zero Room (which is balanced to zero energy), all rooms show up on the Architectural Configuration Indicators.
The default colour for this matter is off-white; however individual rooms (and perhaps the entire interior) can be redecorated quite easily by changing the Desktop Theme. Coral (see illustration) and Leopard Skin are just two of the many options. Once the setting is changed it appears to take several months for the TARDIS to redecorate a room. During this time the TARDIS will place a sign on the door to that room that says "Closed for refurbishment".
Most walls are decorated in glowing roundels that have their own power source. Behind some roundels are medical kits, storage lockers, emergency controls, and circuitry access. Aside from the glowing roundels there are no obvious light sources in a TARDIS – nevertheless the interior will be quite well lit. This is due to Visual Stabilizer Circuits, which are capable of generating and controlling photons anywhere in the TARDIS. The interior lights can be controlled from a switch on the console or by voice commands. Normally the interior of a TARDIS is quite sterile and its atmosphere is automatically-cleaned. Rooms in the TARDIS have air vents. Some have four-bladed transparent ceiling fans to move the air. Using this Architectural Configuration Program, the operator can lock or unlock any door in a TARDIS interior from the console (there is a white flash around the frame when a door locks or unlocks).
The following color code is used:
- Black: For information from the TV Series, including Dimensions in Time, and 1996 TV Movie.
- Blue: For information from the Novels and Audios including Target, Virgin, BCC, and Big Finish.
- Green: For information from 'licensed' reference sources such as the Technical Manual, Doctor Who Magazine, and the Role Playing Games.
- Red: For information from unofficial sources -The Faction Paradox series, behind the scenes interviews, author's speculation, and popular fan belief.
The TARDIS Technical Index is copyright Will B Swift.