▁incident . ▁Japan ▁was ▁afraid ▁that ▁this ▁dis aster ▁could ▁occur ▁again , ▁because ▁the ▁Russian ▁Civil ▁War ▁continued . ▁As ▁a ▁result , ▁the ▁budget ▁for ▁the ▁vessels ▁was ▁re arr anged : ▁only ▁the ▁lead ▁ship ▁of ▁Kam oi - class ▁o iler ▁was ▁built , ▁plus ▁three ▁oil ers ▁of ▁O nd o - class , ▁one ▁food ▁supply ▁ship ▁( M ami ya ), ▁and ▁one ▁ice bre aker ▁( Ō tom ari ). ▁ ▁As ▁Japan ▁had ▁no ▁prior ▁experience ▁in ▁building ▁ice break ers , ▁the ▁I J N ▁began ▁by ▁obser ving ▁ice bre aker ▁architect ures ▁of ▁neighbor ing ▁countries , ▁and ▁decided ▁to ▁base ▁ Ō tom ari ▁on ▁the ▁Russian ▁ice bre aker ▁Dob ry ny a ▁Nik it ich . ▁The ▁I J N ▁hurried ▁the ▁construction ▁of ▁Ot om ari , ▁because ▁they ▁wanted ▁her ▁by ▁the ▁Winter ▁of ▁ 1 9 2 1 , ▁and ▁she ▁was ▁launched ▁less ▁than ▁four ▁months ▁after ▁her ▁ke el ▁was ▁laid ▁down . ▁ ▁She ▁was ▁assigned ▁to ▁ Ō min ato ▁Guard ▁District ▁and ▁took ▁northern ▁pat rol ▁duties , ▁and ▁continued ▁active ▁service ▁throughout ▁her ▁life . ▁ ▁Because ▁ Ō tom ari ▁was ▁small ▁and ▁ag ing ▁by ▁World ▁War ▁II , ▁the ▁I J N ▁planned ▁her ▁succeed ing ▁ship ▁Es an ▁( <0xE6> <0x81> <0xB5> 山 , ▁Project ▁Number ▁J 2 3 , ▁ 6 , 8 0 0 ▁tons ▁standard ) ▁under ▁the ▁K ai - Mar