The Captain’s basso voice rumbled out of speakers arranged some distance from his corpse. Complex algorithms scanned his brain patterns and translated the results into speech, fleshing out the responses when required. He had no real right to be conscious at all, really - all neural activity should have ended when his core temperature had dropped below freezing. But his brain was webbed by tiny machines, and in a way it was the machines which were thinking now, even though they were doing so at less than half a kelvin above absolute zero.
