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The 〔30 May 1921, Notice No. 104, ''Named one auxiliary vessel.'', Minister's Secretariat, Ministry of the Navy.〕 was an icebreaker of the Imperial Japanese Navy (IJN) serving during the 1920s through World War II, the only ship of her class. She was an only icebreaker as warship in the IJN. ==Background== ''Ōtomari'' was planned as one of the ''Kamoi''-class oilers under the Eight-eight fleet plan at first. However, Nikolayevsk Incident changed her future. IJN was not able to dispatch their warship to Nikolayevsk which froze, because they did not have an icebreaker. All Japanese civilians were killed by terrorists in this incident. Japan was afraid that this dire disaster could occur once again, because the Russian Civil War continued in this time. As a result, the budget for the vessels was rearranged: only the lead ship of ''Kamoi''-class oiler was built, plus three oilers of ''Ondo''-class, one food supply ship (''Mamiya''), and one icebreaker (''Ōtomari''). As Japan had no prior experience in building icebreakers, the IJN began by observing icebreaker architectures of neighboring countries, and decided to base ''Ōtomari'' on the Russian icebreaker ''Dobrynya Nikitich''. The IJN hurried the construction of ''Otomari'', because they wanted her by the Winter of 1921, and she was launched less than four months after her keel was laid down. She was assigned to Ōminato Guard District and took northern patrol duties, and continued active service throughout her life. Because ''Ōtomari'' was small and aging by World War II, the IJN planned her succeeding ship ''Esan'' (恵山, Project Number J23, 6,800 tons standard) under the Kai-Maru 5 program in 1942; however ''Esan'' was canceled in 1943. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Japanese icebreaker Ōtomari」の詳細全文を読む スポンサード リンク
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