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British S class submarine.
The Germans were not the only navy that could use submarines as the Germans learned in the Norwegian campaign.
However, we have discussed this before. If the Germans don't build at least a few large ships the British don't have to build all of their large ships either.
The Large German ships tied up a disproportionate amount of British effort and caused a number of older battleships to stay at sea as distant escorts tying up man power, maintenance and tens of thousands of tons of fuel oil.