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Instead of ignoring the report from the USS Ward that it had sunk a submarine in the approach to the harbor, the Navy reacts. The Battleships are warmed up and sent out of the harbor into the waters off Pearl Harbor. This leads to the Japanese strike forced to engage them off Oahu. Does this make the Japanese attack more or less successful?
If they can sink the BBs in the deeper water there will be no recovering them like in OTL. Or will fewer ships be lost since they will be maneuvering and alerted.