I'll admit upgrading to the VIIC has been a welcome change; and here's the proof. This carnage took place near the southern entrance to the Irish Sea. Seven ships, including 2 swan class destroyers, were sent to the bottom for a gross tonnage of 42,000. I have to admit, though the type IID is certainly more advanced than it's predecessor, the type IIA, the IID pales in comparison to the VIIC's speed and torpedo capacity. Without the lessons provided by the IID however, I doubt I could make the Type VIIC perform so well.
This photograph was taken by the WO twenty minutes after torpedo impact.
