Ok i guess ill acutally attempt to answer the orginal question.
Ok yah, as stated the VIIC is a few seconds faster on the dive, and can dive a little bit deeper.
The VIIB is a bit slower to dive, but has a little bit more fuel and underwater range.
The biggest difference however is in conning towers.
the VIIB only has two conning tower types.
The VIIC has 4 towers. All of which progressivly upgrade your AA ablity.
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