As the Totality entered the galaxy, its influence began to spread at the time when the USS Erebus was en route from Vulcan six days ago when the warp core suddenly breached. Unfortunately, the core could not be ejected and the ship exploded leading to the presumed death of all personnel on the vessel including Admiral Mueller. This was a great loss to Starfleet as they lost one of the leading members of Starfleet Command as a result. (TOS novel: Captain's Glory)