USS Seawolf In Yokosuka

I was very interested to see the reports that USS Seawolf (SSN 21) had recently visited Yokosuka, Japan -- she isn't expected to transfer to the Pacific until next summer. How did she get from Groton to Yokosuka, I wondered? I figured the Navy would have publicized it if she had made her first trip through the Panama Canal. Then I remembered there's another route...