Properly speaking TARDISes are best described as "spaces," rather than "objects." Most TARDISes are Dimensionally Transcendental, meaning that they are bigger on the inside than the outside. This effect is achieved by making a TARDIS's interior a quasi-dimensional continuum located outside of Time in a different dimension then the exterior. This Micro-Universe is created using Transcendental Block-Transfer Equations that don't interface with Normal Space in a traditional way. A Time Lord can tell when one is in a dimensionally transcendental chamber by looking for a slight warping on the edge of his field of vision. Crew members will find that for every month they spend inside a TARDIS they will age slightly less then a week.
Dimensional Transcendentalism is achieved using the Relative Dimensional Stabilizer, which time maps the para-dimensional interior though null-space and the Vortex and onto the Exo-Shell's exterior outlet. This Time Mapping forms the Dimensional Gateway. The dimensionally transcendental nature of a TARDIS can be thought of as a hypercube (i.e. a 4 dimensional square).
A TARDIS's interior is composed of a complex web of bio-mathematics and exitonics with a finite multi-dimensional mass, which usually totals about 68 thousand metric tonnes. The size can be altered using the dimension scale control on the console. While a TARDIS's minimum interior volume is about the size of an atom, its maximum volume is about one trillion cubic kilometres
The interior of a TARDIS is incapable of holding an object that is several miles across without extensive block-transfer modifications. In such a state one could walk for 10,000 years with only a few hours of rest a day and never reach the end. The great size of a TARDIS interior is also rumoured to be linked to the vast depths and capabilities of a Time Lord's mind.
During the Time War the matter used for the internal structure of a TARDIS can withstand a full-on thermonuclear blast. It is theoretically impossible for there to be a breach between the TARDIS's micro-universe and the Vortex. This is because the Internal Dimensional Units act to prevent internal trans-dimensional breaches. Nevertheless such breaches have been known to occur under extreme circumstances, and there is a high-pitched alarm designed to alert the crew if the structural integrity has been breached. While a TARDIS interior can't be breached by a Vortex Infarction or a Time Scoop, it is possible for a charged vacuum embodiment to cause a wormhole that could penetrate the interior. Such a breach in the endo-shell of a TARDIS could (among other things) allow all the air to leak out.
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.