Board Thread:Questions and Answers/@comment-2132878-20171013211442/@comment-11700680-20171014211451

Put another sonar on Yuubari and hope for the best is all I can say about dealing with the sub, or hope that you DON'T get the sub at the boss. When I got to the boss I didn't have the sub formation, so that was just bad RNG for you. Keep trying is the best advice anyone can give right now.