It's the underground station that serves the Cruise Terminal at Yokahama, i was told about it by the ship's agent, who then took me down to see it. I told Capt McN and we - plus two local 'welcome' girls, then went down with the ship's phots for a photo shoot!
Great photos, and thank you for having us guessing!
Goodness me, even geographically, my guess was not a hundred thousand miles removed from where it was all happening...
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I hope you got to see Hikawa Maru while you were in Yokohama port!