Talk:World 1/@comment-26049705-20150127190447/@comment-26058113-20150127213849

I never got my first sub from 1-5 drops until HQ 60-70. Yes, RNG was that cruel to me. Dunno about exact drop rates, but I had no luck for the longest time after hundreds and hundreds of 1-5 runs, pulling out before hitting the boss node. If I remember right, I got my first I-168 after beating the boss node... I'm inclined to believe that it has a higher drop rate than the nodes before it, but that's just me. You might not wanna beat the boss so much as to not inflate your HQ level too quickly (Pre HQ 80, 1-5 is good for grinding DDs and monthly medals).

You can also try constructing one through daily construction quests - The rewards pretty much recoup your materials for one attempt (check the Construction page for recipes). I got my very first sub, I-8, through construction after getting tired of grinding 1-5 so much, so it's worth a try.

As long as if you keep running expeditions that drop buckets and do the easy daily quests that reward them, don't feel too bad about using one for a 4 hour repair, especially at HQ 36, where you're probably wanting to clear as many maps as possible. Be smart about using them, have some patience, and they'll eventually stockpile. ...You'll definitely need a decent stockpile as you progress further into the game and/or if you wanna participate in coming events.