Time Fracture

The Time Fracture was a time anomaly and transdimensional portal which was located and observed at a former UNIT Black Site, located at coordinates 51°30'47.7"N 0°08'51.9"W, (WC: 14681 UNIT Field Log) from 8 June 1980. (WC: 14682 UNIT Field Log) The Doctor admitted to being frightened by the Fracture, which had the makings of an "infinite temporal collapse". (PROSE: Hello And Congratulations!)

History
The Fracture was created (PROSE: What the TARDIS thought of "Time Lord Victorious") in 2059 when the Tenth Doctor declared himself Time Lord Victorious and changed history by saving Adelaide Brooke on Mars and returning her home to Davies Street. (TV: The Waters of Mars) The Doctor's TARDIS watched as "a paradox was born" upon her stepping onto the street, widening into the Fracture. As the TARDIS had anticipated, (PROSE: What the TARDIS thought of "Time Lord Victorious") the Doctor used the Fracture to access the Dark Times after Adelaide's suicide, arriving on the planet Andalia. (PROSE: The Knight, The Fool and The Dead)

Another belief was that the Fracture appeared during the 1940s caused by a Luftwaffe bomb, but potentially something more sinister than that. The bomb supposedly detonated, but instead of a typical explosion, the entire building went missing, and in its place was simply the Fracture. (PROSE: Welcome to Operation Time Fracture)

The Fracture spread out through time, (PROSE: What the TARDIS thought of "Time Lord Victorious") such as Central London, (WC: 14683 UNIT Field Log) where UNIT began observing one of the transdimensional portals on 8 June 1980. (WC: 14682 UNIT Field Log) The Doctor realised that the Fracture could potentially destroy the universe, but reasoned that UNIT were doing a good job of containing it, and that "parking" a complex space-time event like the TARDIS next to the Fracture might make the problem worse rather than better. Between this logic and their own fear of it, they avoided trying to interfere with the Fracture.

A human explorer became trapped in a time loop after entering the Time Fracture, remaining trapped for 20000 subjective years reliving the same adventure over and over. During their repeating adventure, the explorer discovered a darkness behind Zaggit Zagoo, found out the secrets of Zoria, and listened to "the wrong ghost" on Gallifrey. On their millionth go-around, the Doctor managed to get a message through to them, congratulating them for their resilience and promising that the final loop might be close in their sights. As "something" had been moving through the Fracture, trying to get out, and was making the Fracture exponentially more dangerous in the process, causing it to suck more and more of the universe into itself, the Doctor was beginning to think the time would soon come when they should enter the fray themself. (PROSE: Hello And Congratulations!)

Behind the scenes
Although appearing in other parts of the Time Lord Victorious storyline, the Time Fracture was primarily featured in the interactive stage play of the same name. There, they explained that the Time Fracture was actually created by the detonation of a bomb called the Temporal Disruptor. This was part of the Time Lord Zoria's plan to destroy the universe so the Time Lords could rebuild it in their own image and become rulers, as this would ensure her family's survival.