Board Thread:Questions and Answers/@comment-24731329-20150303101022/@comment-25730832-20150305165412

People do have duplicate ships in their base especially subs. This is because subs aren't that expensive to repair and ressuply and they can be your tank for 3-2A grinding. Keep that 2nd imuya for that.

As for other girls.

i-58 is the 2nd easiest you can find since you can either craft or get her from 1-5 and many other maps.

i-8 is the harder one but can still be craft or found

i-19 is the even harder one because you can only get her as drop.

Maruyu is either easy or hard depending on your luck in LSC

You can't get U-511 as it's a reward for the Winter Event unless you clear that.

And finally; i-401. She's the hardest to get even via LSC. Don't fret if you can't get her. There's a reason the requirement is only 4 SS.