Talk:Development/@comment-24021992-20131201115741/@comment-111.104.112.15-20131201121444

Type A ko-hyoteki AKA midget subs are only equippable on torpedo sisters (Kitakami and Ooi) at level 10, and Chitose and Chiyoda seaplane tenders (Chitose-class, once converted to CVLs, cannot equip midget subs). Midget subs can be gained for free by remodeling Chitose-class seaplane tenders in level 12.

Oxy torps should be craftable, but I haven't seen people talking about it much. If you want guaranteed quadruple oxygen torpedoes (which are still powerful, BTW), you may want to farm the torpedo sisters, level them up to 10, remodel, and free 2 quad oxy torps per sister. Even more extreme? Farm and level them up to 50 for 1 quintuple oxy torp per sister. Either way, it's equally difficult. I managed to get a bunch of Kitakamis grinding in 3-2-A, btw.