The ten forward firing tubes in the British T class comprised of the "normal" six interior tubes in the torpedo room. Above them, outside of the pressure hull but under the casing, were two external tubes. (Like the external storage in a U boat, except these were launch tubes facing forward.) The other two forward tubes were either side of the conning tower, where the casing bulged out to allow a walkway around the tower. So they didn't do much to increase the cross section.
Very handy if you stumble upon the Tirpitz.
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"Pitt was the greatest fool who ever lived to encourage a mode of war which they who commanded the seas did not want, and which, if successful, would deprive them of it." Earl St.Vincent (allegedly)
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