Talk:World 2/@comment-25006886-20140713172238/@comment-24978536-20140713173909

You really don't need any other ships to level submarines on 2-3. Just get your submarines to level 10 in 1-1, max their armor and torpedo stat, and they will be ready to tacke 2-3 on their own. They might take some heavy hits easily before level 20 though, but 2-3 is still doable with just submarines alone. You could also use them as a target on 3-2 or maybe even 2-4 if you haven't unlocked 3-2 yet, and they will slowly get their levels.