The Eye of Harmony Copy
(aka Point Zero, the other Heart of the TARDIS)
One of the Hearts of a TARDIS (like Time Lords, a TARDIS has two) is a massive energy collector that is a mathematically constructed copy of the Prime Eye of Harmony on Gallifrey. In modern times it is often referred to as an Eye of Harmony (which can cause some confusion). Because of this, some Time Lords refer to it as Point Zero. These Eye copies can be found on all TARDISes after the Type 24. The Eye's iron-like Containment Sphere is located beneath the Cloister Room. While the Prime Eye's Containment Sphere is 10 km in diameter the TARDIS's sphere only about the size of a house.
Artron Energy created by the Prime Eye of Harmony on Gallifrey is broadcast into the Space-Time Vortex. This energy travels though the Vortex's Time Contours. Attached to a TARDIS's Containment Sphere is the Receptor Antenna, which collects artron energy using chronon transduction. The naked singularity at the Heart of a TARDIS is directly linked to the Space-Time Vortex, and uses Chronon Transduction to collect the energy.
This creates a link between a TARDIS's Eye and the Prime Eye on Gallifrey. The TARDIS's Heart then emits the beams of Artron Energy to power a TARDIS. The Eye is equipped with a Flux Comparator to ensure a steady flow of energy. The Eye also serves to slowly vent the potential energy stored from dematerialization. This Hawking Radiation is leaked from the Eye's event horizon. As long as the Prime Eye of Harmony on Gallifrey remains in existence, a TARDIS's energy source will never stop producing power.
This room, sometimes known as Point Zero, is the nexus point where all of the TARDIS's internal dimensions meet and are balanced. The closer one gets to the Heart of the TARDIS, the stronger the dimensional "pressure" gets. This "pressure" can have minor effects on the nervous system. If someone were to actually look directly into the Heart while it was transducting energy from the Prime Eye of Gallifrey their consciousness would be destroyed by the intense blasts of ArtronEnergy, leaving only a mindless body behind. Like the other Heart of the TARDIS (the Main Space-Time Element) the Eye can, under the right circumstances, restore the dead back to life. For more information see the entry on the [link=spacetimeelement]Main Space-Time Element[/spacetimeelement].
When a TARDIS is de-registered and made non-operational, the Eye is opened for a short time to de-energize it. Once de-energized, a TARDIS can only be reactivated using special Gallifreyan technology. Even with a plentiful fuel supply a drained TARDIS can't hold a charge and will need a "jump-started" to dematerialize. This is usually done by inserting a charged Neutron Rod into the receptor socket on the Console, but other power sources, such as a Time Ring' can also be used. Whatever the source, the power reading must be well above 0.2 omegas [ext]for a TARDIS to be energized. Even with a plentiful fuel supply a TARDIS can't hold the charge and will need a jump-start to dematerialize.
The Eye is protected from unauthorized tampering by a retina print lock that only allows Time Lords to open the Eye. This lock can only be changed by altering the Security Matrix on Gallifrey. If the Eye is opened outside of a Dry Dimension Dockyard, it will cut off the flow of Artron energy to the Dynamorphic Generators. Having the Eye of Harmony open alters the molecular structure of any nearby planets. The TARDIS will attempt to contain the Eye's energies, but if it is left open, the containment fields will drain all of the Auxiliary Power within three hours. At the end of this time any nearby planets will be destroyed in a massive burst of Gravitational Energy. If the Eye is left open for too long the TARDIS will die. Stasis Halos (similar to the Sash of Rassilon) should be used by the operator whenever working with an open Eye.
There is a switch labelled "Do not push" that will collapse an entire TARDIS into the Eye of Harmony. A Time Lord who is very close to their TARDIS can probably send telepathic messages to cause its Eye of Harmony to detonate in a massive explosion that would destroy everything for miles./ext] A TARDIS being destroyed in the Vortex might buckle causality in the Web of Time for centuries in either direction, and with the right technical knowledge and temporal abilities it would be possible to sabotage a TARDIS so that it would destroy the entire Universe. This would be done by allowing the temporal energy to burn simultaneously at every point in space and time. As the moment of total event collapse approaches cracks in the fabric of the universe would begin to appear throughout space and time. Anything exposed to the temporal power of these cracks would be erased from history becoming a never-person or never-object. Some of these cracks would be big enough to consume whole planets.
Since the Heart of the TARDIS is a copy of the Eye of Harmony, it can also serve as an temporary independent power source if the Prime Eye of Harmony is out of range (see Noosphere Parameters) or has been disabled. However the fuel supply of this Copy Eye is not unlimited. Given that the iron sphere that holds the Prime Eye is about 70 million times as big as the one holding a TARDIS's Eye it is possible that the Heart of a TARDIS has only 1/70,000,000 the fuel capacity of the Prime Eye. A fully fuelled TARDIS can travel at least 200 trillion years without completely exhausting the fuel supply. If specifically re-engineered, a TARDIS can just make it to the Universe's outermost planetoid, Hindmost. In any case, it appears that the Copy Eye is capable of supplying independent power for at least a few years.
Without the Prime Eye of Harmony a TARDIS would eventually have to refuel itself. A TARDIS can travel at least 22 billion years before refuelling. When necessary, the Eye's Receptor Antenna is also capable of collecting temporal energy from temporal instabilities, fault-lines running between dimensions, scars on reality, or rifts in time and space that found throughout this Universe. Time Rifts make the best fuel source. Such a rift occurs when two or more dimensions are pressed against each other creating a rift or a scar like an earthquake fault line. The TARDIS can drain off the energy created by the competing forces. Depending on the current energy level of the rift it can take a few minutes to a few days for the TARDIS to power up completely. The rift energy collected by the copy Eye is processed into Artron Energy to make it usable by the Transpower System. This energy is stored in the TARDIS's other Heart (aka Main Space-Time Element) located in the Console. A TARDIS's Emergency Procedures will automatically try to divert any large explosion or energy release that occurs inside the TARDIS into its Eye of Harmony.
It should be noted that if a TARDIS that relies on scavenged fuel (as opposed to the Eye of Harmony on Gallifrey) travels into another universe it would be left without power. Fuel collected in this Universe can only be used in this Universe. The TARDIS would be dead unless a source of Gallifreyan energy or a local source of rift energy could be found. If any of the TARDIS's small Power Cells retain power, they can be charged up if the operator donates a dose of artron energy equivalent to 10 years of their life. Once the cell has finished its recharging cycle (about 24 hours) and powered back up, it can be used to give the TARDIS five minutes to attempt a space-time jump.
Should power from the TARDIS's Heart be unavailable, the TARDIS will have to rely on the Ancillary Power Station for emergency energy.
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.