If you're trying to get AI to link to each other, they are actually on the link persisetently, even when underwater. Yeah, I know. I don't know what would cause them not to link normally to a human player though, except if they're not shallow enough. It generally works (I've definitely done it successfully with AI 688Is and Delta IVs).
You can find the weapons in the mission editor under the "Civilian" category, in triggers such as approach triggers.
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