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What if future rescues in space are complicated by the presence of hostile opponants? Messages will be intercepted. Ships can be detected. Sophisticated artificial intellegences are still susceptible to hacking -- inquisition, suggestion, coercion. A human being has no place here.
What is needed is a simple AI, a tiny spaceship, an single-minded mission. Two of those are easy; but how do you build an AI basic enough to get the job done without betraying the mission?