The Mk. 10s have a shorter range, which means you have to get up real close and personal to targets. The S-18 is pretty useless against fast moving warships. They really do have great dive speeds but oftentimes large cargo vessels travel faster than the sub. So, I use the advantage of this sub- small and fast diving to sneak into harbours and wallop the stuffing out of sleeping ships. It's the only way to get targets using the realism Mods in which ships detect torp wakes easily.
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