Subspace log

A subspace log was a log of incoming and outgoing subspace communications. In Federation starships of the mid-23rd century, this log was periodically filed by a ship's communications officer.

In 2266, after Lieutenant Nyota Uhura, the communications officer aboard the USS Enterprise, had filed a subspace log, her supervising officer, Lieutenant Commander Spock, informed her that there was an error in the frequencies column. (TOS: "The Man Trap")

When Ro Laren was confronted by Jean-Luc Picard about leave the USS Enterprise-D without authorization, in 2368, she told him that she had actually gotten permission via communication from Admiral Kennelly, which she said could be confirmed by the subspace log. (TNG: "Ensign Ro")

Later that year, Data and Spock, who had hacked into the Romulan Information Net, were able to access Romulan subspace logs that identified a transmission from the Romulan surface to a Barolian freighter near Galorndon Core, which simply contained a short sequence of numbers: 1400. (TNG: "Unification II")

In 2369 Constable Odo checked all of the communication logs during the Klaestron Civil War and found evidence that Curzon Dax and Enina Tandro had an affair. (DS9: "Dax")

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