Detection or not is, of course, in the code and there are several ways about it. In some games, it's distance and distance alone with a set distance within which the sub is detected, regardless. A more sophisticated algorithm takes daylight and rarkness into account effectively giving you 2 distances, one for each half of a 24 hr day. A more sophisticated algorithm deals in probability for detection and here ambient lighting conditions could be one of several factors alongside distance.
Having the light in the sub during night ops either turned off or set to red could also be coded to make a difference.
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