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Ulysses, Penelope Gate, and Saldaamir studied the temporal cicatrix in the Shoal because it was useful for the project they were working on. During this time, they met Larna. When Marnal interrupted their work, they used his TARDIS' telepathic circuits to wipe his memory and deposited him on Earth in 1883 so he would not be able to jeopardise the project. (PROSE: The Gallifrey Chronicles)
In 2001 Joyce and Larna used the temporal cicatrix in San Francisco to conduct experiments for the Project. By that time, they had been providing grants to the Society for several years in exchange for "appropriate biological data". (PROSE: Unnatural History)