Range would be the point. The IXC for example, off the top of my head carried an extra 40 tons of fuel or something... compared to the IXB. The IXC/40 was another expansion on the IXC and had more fuel again, and then you get to the IXD and they had the capacity for ranges similar to the US subs.
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I SURVIVED THE FIRST EVER SUBSIM WEREWOLF HUNT - and... I actually won the game for the humans too!
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