The main benefit is the range, more fuel and that mean you can go to the operative area more fast and forget the constant preocupation about fuel by the IIA.Improved dive depth also and a twin 20mm in deck.
This submarine is also one my favorites and actually I am in de middle of 1940 with one IID.
This type remember me also the old film with Frank Sinatra about the recover of one submarine of this type in the Caribeean and his utilisation for a hold-up againts the "Queen Mary".
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