Talk:Z1/@comment-101.255.68.197-20150126080727/@comment-84.90.161.45-20150204130440

Z1 is only obtainable through D8 quest, which requires D7, D6, D5 and A27 quests to be completed first.

This means that you have to have at least 4 submarines and send them 4 times on a 48 hours long expedition, followed by a 2 hours long expedition. Yes, 1 week worth of expeditions just for that.

For the last part, the minimum fleet combined level is 200, which means that the subs should be at least lvl 50.

Not sure if you can send other ships with them, when I did it my subs were in their 60's, so there was no need for extras.

You get Z1 out of that, as well as 2x Ju87CKai dive bombers.