I can't answer that question for real life. In game, it depends on the skill level of the AI. For stock or vanilla game, it's random. Mods will change the skill level. If the enemy AI crew is at the lowest level, you'll get the situation you just described. If the enemy AI is at the highest level, then they ping constantly and can detect you if you are running silent below the thermal layer, on a dark and stormy night.
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Of all the forms of Martial Arts, Karaoke causes the most pain!
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