Talk:Mackerel/@comment-29621957-20170929200607/@comment-460323-20170929201311

3-3 is the best.

You can get Hiryuu / Souryuu dups for premium support expedition planes.

You can also get T21 from rarer aircraft carriers, which is needed in quite a number of plane improvements (especially the monthly T21 -> T21 skilled -> T52 quest).

You also get 41cm from Nagato-class to improve your proto 41, 16inch, etc.

It's a nice place to level your Hiryuu / Souryuu dups too.

It's just a convenient map to get many things done at once :v.