I'll wait and stave off the frustration. Every new sub in real life brings both advances and issues that bubble up from sea time until the Planning Yard can get a fix on the alterations and re-designs right.
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DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol:
http://www.uboat.net/today.html