List of submarines by upgraded maximum stats

• Submarines can only be attacked by destroyers, light cruisers, torpedo cruisers, aviation battleships/cruisers with seaplane bombers, and some light aircraft carriers. In addition, they are prioritized to attack submarines first, meaning other ships can get away with no damage done to them.
• Submarines are the most resource-efficient class in the game; they cost almost nothing to deploy or repair.  Furthermore, they constitute cheap additions towards multiple expeditions that can utilize them.
• Submarines equipped with Type A Ko-hyoteki will perform a preemptive torpedo strike before the shelling phase. After reaching level 10, they'll be able to preemptively attack without any equipment at all.

Highlight notes:

• Green: Outstanding
• Yellow: Above average
• Since the Luck Stat is difficult to modernize, it is listed as Base(Max).

No.	Name	Class
126	I-168 伊168改 Nicknamed Imuya	Kaidai 6a	50	11	69	0	0	29	10(49)	15	18	49	Slow	0	10	20
127	I-58 伊58改 Nicknamed Goya	Type B3 (SSV)		12	84			39	50(79)	18	19			2(1,1)		25
123	I-19 伊19改 Nicknamed Iku	Type B1 (SSV)			89				13(59)
128	I-8 伊8改 Nicknamed Hachi	Type J3 (SSV)		14	84				25(69)	19
155	I-401 伊401改 Nicknamed Shioi	Sen Toku (SSV)	35	19	80			45	20(59)	24	24	44		6(3,3)	25	30
163	Maruyu まるゆ改	Type 3 S.T.V.	20	5	19			4	7(77)	7	11	13		0	10	10
231	U-511 U-511改 Nicknamed Yuu	Type IXC	35	12	64			29	34(67)	13	20	59			10	20
236	Ro-500 呂500		55	13	69			34	44(77)		21	68