At some point before 2149, T'Pol served a tour as deputy science officer under Captain Voris. She worked closely with Chief Engineer Solin. (ENT episode: "Impulse") In December 2152, the Vulcan High Command dispatched Seleya to the anomaly-ridden Delphic Expanse. When contact was lost, Vaankara was sent to seek Seleya. Vaankara's crew went berserk, and the ship was destroyed. (ENT episode & novelization: The Expanse)