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*Reward from quest in Christmas 2013 Event.
*Only available to use during Christmas 2013 Event period (removed when the event over).
*She is the only submarine as of now that have fast speed and long range.
{{Shipquote
{{Shipquote
| 自己紹介=潜水艦イ401、イオナ。 急速せんこ～。
| 自己紹介=潜水艦イ401、イオナ。 急速せんこ～。