Submarines of vii series became the most known submarines of the second world war and the most numerous submarines in history. The difference was a stronger pressure hull giving them a deeper test depth and lighter machinery to compensate for the added steel in the hull, making them slightly lighter than the viic. They were used to supplying fuel to ether submarines to increase their time on patrol, and for this purpose they carried an additional 203 tons of fuel.
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Builders, werk numbers, order dates and detailed drawings of all types, and many other interesting details
Type viic/41 was a slightly modified version of the viic and had the same armament and engines