Zurai is correct 'Hidden Nationality' and 'Submarine' (invisible except to the appropriate units AND to the AI's movement sub-programs) are the two seperate flags in question. Hidden nationality land units are quite fun land versions of the privateer that you can use to raise some hell with your enemies without starting a war. The drawback is that you can capture cities with them and so they can be a little unbalancing. When I was talking about invisible before I meant submarine
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