They have to be scripted into the campaign game.
In TM, if your in the SW pacific, you have a small chance to see a german uboat near the java seas area, but they are pretty rare sight. Right now im stting on TMO SP2.... im tinking about wrapping it up and calling it quits on it.. not sure yet. running out of ideas. But.. ive scripted in the Jap AI submarines in this one, and theirs a better chance to see one of those then a german uboat.
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