Board Thread:Special Events/@comment-121.7.198.251-20151129015829/@comment-26091666-20151201123017

@77.198.49.90

I got my U-511 when she made her first debut at Winter 2015 Event and I haven't even done let alone unlocked any of the pre-requisite quests/expeditions leading up to Z1. So therefore I'd vouch that it is possible in theory.