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Originally Posted by ak_aramis
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Well familiar with it ;)
There are also the submarine cruisers, such as the Surcouf and (unbuilt) Type XI U-cruiser.
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the third thing is a power source better than the diesel-electric subs had.
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As malloyd said, the battery life is the real problem. However, with snorkels a sub can run just under the surface and still use the diesel engines. Only when it has to run deeper than periscope depth does it need the batteries.