In 2268, the T'Pau was assigned to transport the Andorian archaeologist, Dr. Threllvon-Da, and his team to Alnath II to investigate the ruins on the surface. While surveying the planet, the Vulcan crew became affected by the Alnathian jewel and left orbit, stranding the archaeological team on the surface. The T'Pau was later discovered by the USS Enterprise adrift at the edge of the system, and found that all 74 Vulcan crewmembers were dead. Although the cause of death was indeterminate, a new Klingon weapon was initially suspected, as the IKS Terror was found in orbit of the planet. Once the true nature of the Alnathian jewel was discovered, Spock concluded that the Vulcans had been transformed into non-corporeal beings of pure intellect, and left their bodies behind to pass to another pl