Hi KF
You start off with a VIIA although there is an additional mod that allows you to start with a VIIB, or you can add it anytime you are in the bunker.
There is a link in the TWOS Post #1 if you fancy that option.
In the normal game the change from VIIA to VIIB upgrade occurs IIRC when you have earned enough skill points due to the amount of tonnage sunk you are then offered a u-boat upgrade.
The VIIC boat is the stock boat in the 3rd Campaign Mare Nostrum.
The VIIC41 boat is the stock boat in the 10th Campaign Turning Point.
Peter
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