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A deadlock seal is a form of lock, or a device added to a lock, that is almost impregnable. It is more secure than most locks, and appears to be the only lock the Doctor's sonic screwdriver cannot open.
Notable Uses
- The Big Brother House on the Gamestation (Satellite 5) was fitted with deadlock seals after the contestants of a previous edition of the show walked out. (DW: Bad Wolf)
- The Krillitanes invading Earth in 2007 used deadlock seals to seal objects, as did the Bane in 2008 and the Humans responsible for the manufacture of cargo ships for that reason. (DW: School Reunion)
- The Master was able to deadlock the TARDIS from inside to prevent the Doctor entering to stop his escape. (DW: Utopia)
- The Heavenly Hosts onboard the Titanic were constructed of double deadlocked circuitry. (DW: Voyage of the Damned)
- Midshipman Alonso Frame used a "Maximum deadlock" to seal the bridge of the Titanic.
- Adipose Industries Headquarters could be deadlocked, this included doors and windows. The deadlocks there can be activated remotely, on command. The computer built into the Adipose Industries Headquarters building (The Inducer) was said to be triple deadlocked, however, the Doctor was able to open these locks after acquiring the sonic device of the owner of the building, Miss Foster. (DW: Partners in Crime)
- ATMOS devices developed by Luke Rattigan for the Sontarans were deadlocked to their respective cars. Furthermore they had the abilty to deadlock the entire Car. (DW: The Sontaran Stratagem/The Poison Sky)
- Deadlocking does not make glass unbreakable. (DW: The Poison Sky) It does, however, make metal incapable of being melted, or even heated, and can prevent cords and doors from being seperated or opened. (DW: The Time of Angels)
- It is possible that one way to create deadlock seals is with a sonic device, as the Doctor has "locked" several things during his travels, particularly the controls of his TARDIS, which even then the Master could not unlock. (DW:42, Utopia, The Sound of Drums, Last of the Time Lords, SJA: Invasion of the Bane)
- John Hart used a portable deadlock seal to lock himself to Gwen Cooper. (TW: Kiss Kiss, Bang Bang)
- Torchwood Three's Torchwood S.U.V. was triple deadlock sealed (TW: Children of Earth)
- One particular Weeping Angel showed the ability to create deadlock seals on structures that aren't equipped with any such device. It is unknown if all Angels possess this ability. (DW: The Time of Angels)