The Vulcan cruiser carrying Sarek to secret peace talks with two Klingon houses in 2256, crippled inside a nebula when his aide, a logic extremist, detonates a suicide bomb.
Sarek's ship appears in the Discovery episode Lethe. During the Klingon War, Sarek sets out for Cancri IV to meet representatives of two Klingon houses who oppose Kol. His aide, V'Latak, reveals himself as a logic extremist who regards dealings with other species as a betrayal, and blows himself up.
Sarek shields himself but is badly hurt, and the ship is left drifting in a nebula where sensors cannot find it. Michael Burnham feels his distress through the fragment of his katra she carries.
Burnham, Tilly and Ash Tyler take a shuttle into the nebula, and Burnham uses a device built by Stamets to reach Sarek's mind and persuade him to switch on the transponder. He is rescued, and Admiral Cornwell goes to the talks in his place, where she is captured.