In 2151, the unidentified aliens placed a device on board Enterprise which was tapped into most of the ship's systems, including internal sensors and communications on all decks. (ENT: "Silent Enemy") In September 2152, Commander Tucker accessed the internal sensors aboard Enterprise from a monitor in T'Pol's quarters to have a closer look at the intruders from the Takret Militia on the bridge. (ENT: "The Catwalk") In 2154, Lieutenant Reed used the internal sensors of the Enterprise to locate the Vulcan bio-signs of Soval but was unable to find him on board. (ENT: "Kir'Shara")