http://starwars.wikia.com/wiki/Endar_Spire
"...Revan, Ulgo, and Onasi engaged the Sith and made their way to the ship's main bridge in search of Shan, who had already escaped. Shortly thereafter, Revan and Onasi got in an escape pod and fled as well, with Ulgo sacrificing himself so that Revan and Onasi would survive. Realizing that Shan was no longer aboard the ship, the Sith fleet opened fire on the Endar Spire, completely destroying it."