Talk:Quests/@comment-26272642-20150924042640/@comment-26407881-20150924080946

I think you might have mistaken quest B17 with Bm2 (both have the exact same japanese name ' 「潜水艦隊」出撃せよ！  '. Try reading the japanese quest description, there should be a part that writes ' 中部海域', implying that it is Bm2 which requires you to sortie to World 6.