These shields help to protect a TARDIS during Vortex travel. Without them the TARDIS will be vulnerable to any passing danger in the vortex. Despite the fact that the Vortex Shields interfere with telepathic communications between people who are in the ship and people who are in Normal Space, switching them off while in the Vortex is not recommended. If the Vortex Shields are overloaded the sub-neutron circuits will start to fail. With great difficulty Vortex Shields can be extended to imprison another Time Travel Capsule operating in the Vortex, however the shields can only hold the other capsule for 2 minutes. The TARDIS Defence Mechanism also acts to hide the TARDIS from potentially dangerous life forms that exist in the Vortex. The Exo-Shell has a Temporal Field, which protects its interior from temporal attacks. Vortex Wraiths would be destroyed by the TARDIS's defences if they attempted to invade the interior. (also see Defence Force-Field Prisms)
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.