Hostile Action Displacement System (HADS)
The Hostile Action Displacement System (HADS) can be found on all Type 38 and later TARDISes. If the HADS has been enabled by setting it in standby mode then the relocation device will automatically dematerialize a TARDIS if its Exo-Shell is threatened. Using the co-ordinate override, the relocation device will shift the TARDIS out
of "range" of the threat. Under normal circumstances it will travel forward in time up to one hour to escape before materializing in a random spot within one mile of its previous location.
As a four dimensional entity, a TARDIS is able to detect (and sometimes respond to) exterior dangers before the danger manifests itself. There are Warning Lights on the control console that indicate present or approaching danger. Some types of dangers can be detected from 20,000,000 light-years away. The system's settings sometimes need to be adjusted as it can be over-sensitive. It is not unknown for cannon balls or even a hailstorm to trigger the HADS. The Anti- Collision Device can trigger the HADS. The system can also be triggered if the capsule is in the presence of a being that is immortal due to being fixed in time in space. TARDISes with Autonomous Control have been known to automatically set the HADS in standby. The HADS has an Emergency Manual Override control, which can activate the relocation device. This is the easiest way for someone without a symbiotic nuclei to perform a micro-jump. As an alternative, the Defence Force Fields or Defence Indefinite Time-Loop Option can be slaved to the HADS to trigger instead.
Because this system will work even when a symbiotically linked Time Lord isn't on-board the HADS is often set when leaving a TARDIS unattended in a dangerous time zone. Certain violations of the 3rd Law of Time can stress the TARDIS's defence mechanisms, weakening the corporeal shell enough that it could be shattered by something a small as a sub-sonic cannon ball. The TARDIS will then have to abandon most of the broken shell and re-grow a new one from what's left. If possible, the TARDIS will use the HADS to retreat into the Vortex while this is done. However the operator doesn't need to be stranded during this time. The TARDIS will try to track down the artron signature of the last crew member to touch her exo-shell and materialize at their coordinates. In most cases the last crew member would be a Time Lord, however if the last crew member lacked a symbiotic nuclei then the TARDIS would be unable to lock on to and materialize at their coordinates. In such circumstances the recommended procedure is for the Time Lord to initiate close physical contact with the crew member being tracked. This will allow the TARDIS to detect the symbiotic nuclei and materialize nearby.
The operator should remember that if a regularly programmed space-time jump is initiated while the HADS's coordinate override is engaged the TARDIS will dematerialize only to rematerialize at the exact same co-ordinates a few seconds in the future. The HADS requires occasional servicing and will have a tendency to suffer minor failures if this is neglected.
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.