Security Relay Station One was a manned station on the planet Kesprytt III. The station was located near Ambassador Mauric's chambers.
In 2370, on a diplomatic mission to evaluate the Kes application for admission to the Federation, Doctor Beverly Crusher and Captain Jean-Luc Picard, both of the USS Enterprise-D, beamed down to this location. The security station reported to the Enterprise-D that they had not received the two Starfleet officers; it was later determined that they had been kidnapped during transportation by the Prytt Alliance, an enemy of the Kes. The contact informed Worf that they had lowered their shields but Picard and Crusher did not rematerialize aboard this station. (TNG: "Attached")
This station was only mentioned in dialogue.