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Submarines (SS, also including "Aircraft Carrying Submarines" SSV) are characterized by relatively low armor and HP. BY contrast, they are difficult to handle using normal "anti-ship" setups, requiring instead specific Anti-Submarine Warfare (ASW) equipment and setups in order to be sunked. Submarine are typically found at pre-boss nodes.

Anti-Submarine Warfare

Attack Behavior

• They cannot be targeted by normal shelling attack
• Submarine are immune to air and torpedo attack.
• Submarines cannot take more than scratch damage at night and therefore cannot be sunk.
  • The exception to this rule is when a battle starts at night, or when in a combined fleet
• ASW attacks is the only to have a damage modifier above 1 with some formation(Diamond, Echelon, Line-Abreast)

Ship type	Specific ship	Condition	Day Battle	Night Battle
All	All	at least 1 base ASW	prioritize SS
AV CAV BBV LHA	All	Bomber +1	Prioritize SS	Don't attack SS
CVL+Kaga Kai Ni Go	All	no more than moderately damaged (中破) have an attack aircraft with +1	Prioritize SS	Nigth Air Attack cannot target SS
	Mogami-class Kou Kai Ni		Prioritize surface target
	Taiyou-class Kai Ni Kaga Kai Ni Go		Prioritize SS	Nigth Air Attack will prioritize surface target Nigth Shelling prioritize SS
	Gambier Bay Mk.II		Prioritize SS	Prioritize SS with night air attack

Damage calculation

Anti-Submarine Warfare

[math]\displaystyle{ \text{ASW Power} = \left( 2\sqrt{\text{ASW}_\text{ship}} + 1.5\text{ASW}_\text{equip} + \bigstar + \text{Type}_\text{ship} \right) \times \text{Mod}_\text{synergy} }[/math]

• [math]\displaystyle{ \text{Type}_\text{ship} }[/math] is a constant depending on the type of the ship performing the attack. See below for details.

Ship Type Constant
Constant	Ship Types
13	Coastal Defence Ships (DE) Destroyers (DD) Light Cruisers (CL/CT) Oilers (AO) (without aircraft equipped)
8	Aviation Cruisers (CAV) Aviation Battleships (BBV) Seaplane Tenders (AV) Light Carriers (CVL) Landing Ships (LHA) Oilers (AO) (with aircraft equipped)

• [math]\displaystyle{ \text{Mod}_\text{synergy} }[/math] is the synergy multiplier bonus from using certain combinations of ASW equips. See below for details.

ASW Damage Synergy
Small Small Sonars	Type 93 Passive Sonar Type 4 Passive Sonar Type 3 Active Sonar Type 3 Active Sonar Kai Type124 ASDIC Type144/147 ASDIC HF/DF + Type144/147 ASDIC
Large Large Sonars	Type 0 Passive Sonar
DCP Depth Charge Projectors (DCP)	Type 94 Depth Charge Projector Type 3 Depth Charge Projector Type 3 Depth Charge Projector (Concentrated Deployment) Prototype 15cm 9-tube ASW Rocket Launcher RUR-4A Weapon Alpha Kai AP Mk.32 ASW Torpedo (Mk.2 Thrower) AP
DCR Depth Charge (Racks) (DCR)	Type 95 Depth Charge AP Type 2 Depth Charge AP Lightweight ASW Torpedo (Initial Test Model) AP Hedgehog (Initial Model) AP Type 2 Depth Charge Kai Ni AP
Other ASW Mortars	Type 2 12cm Mortar Kai Type 2 12cm Mortar Kai (Concentrated Deployment)
ASW Damage Modifiers: [math]\displaystyle{ \text{Mod}_\text{synergy} = {Mod}_\text{1} \times {Mod}_\text{2} }[/math]
[math]\displaystyle{ {Mod}_\text{1} }[/math]	+ (Any Sonar + Any Depth Charge)	1.15
[math]\displaystyle{ {Mod}_\text{2} }[/math]	DCP + DCR and NO Small	1.1
	Small + DCP + DCR	1.25
Examples
[math]\displaystyle{ \text{Mod}_\text{synergy} }[/math]	Small + DCP + DCR	1.4375[math]\displaystyle{ 1.15 \times 1.25 }[/math]
	Large + DCP + DCR	1.265[math]\displaystyle{ 1.15 \times 1.1 }[/math]
Armor Penetration
Indepentant of synergies, some equipment provides additional armor penetration to ASW attacks. The affected equipment are: DCR: Type 95 DC, Type 2 DC, Lightweight ASW Torpedo, Hedgehog, Type 2 DC K2 DCP: RUR-4A Weapon Alpha Kai, Mk.32 ASW Torpedo (Mk.2 Thrower). The flat armor penetration value is calculated as follows: [math]\displaystyle{ \text{Pen} = \sum\limits_{\text{Equipment}} \Big( \sqrt{\text{ASW}_\text{Equipment} - 2} + \text{Mod}_\text{ship} \Big) }[/math] With [math]\displaystyle{ \text{ASW}_\text{Equipment} }[/math] the base ASW stat of the applicable equipment, Visible Bonuses and Improvements are not counted here. [math]\displaystyle{ \text{Mod}_\text{ship} }[/math] being 1 for DE, 0 otherwise, Note Armor penetration from equipment stacks, The final armor of the targetted submarine cannot go below 1.

• The bonuses do not stack, meaning only the highest possible bonus applies.
  • The exception is when using the special depth charge projectors detailed above.
• Multiple equipment of the same type still only apply the bonus once.
• There is an accuracy bonus as well but it is small. Stacking sonars will give a bigger accuracy bonus.

Notes

• When contributing to ASW power, Base ASW is square rooted, while equipment ASW is multiplied by 1.5
  • ASW equipment is therefore the primary source of ASW damage, with base ASW playing a very minor role.
  • However, base ASW is the primary determinant of whether a ship can reach 100 total ASW to perform opening ASW attacks.

LBAS

See the Land-Based Air Squadron page

• Only ASW Planes (7+ ASW) can attack submarine during this phase.
  • If submarines are present, those planes will prioritize attacking submarines, while other attackers will only be able to attack surface targets.

Opening ASW Shelling (OASW)

Commonly referred to as OASW (opening ASW). All eligible ships will perform a regular ASW Shelling attack, following range order in the same fashion as the First Shelling Phase. As these opening attacks happen before the Opening Torpedo Salvo, they may disable or even sink enemy submarines before they have a chance to attack.

OASW has the following trigger conditions:

• Only ships listed below can trigger an OASW,
  • The ship is not required to be able to perform any ASW Shelling.
• They must meet their specific ASW stat threshold and requirements, listed below,

OASW Ship	ASW Stat Required	Equipment Required
Any DD, CL, CLT, CT, AO	100+ ASW	1 Sonar Equipped
Kai Ni Juu		+ Bomber / / / Sonar + Any Seaplane Bomber, or Rotorcraft, or Liaison Aircraft, or Dive Bomber, with 1+ ASW
		+ Bomber / / Sonar + Seaplane Bomber, or Rotorcraft, or Depth Charge
Any CVL		+ / / / Sonar + Any with 1+ ASW
	50+ ASW	+ / / Sonar + Any with 7+ ASW
	65+ ASW	/ / Any with 7+ ASW
Any DE	60+ ASW	1 Sonar Equipped
	75+ ASW	Total of 4+ ASW from equipment
Kai Ni D Fletcher-class John C. Butler-class Kai/Mk.II J-class Kai	Can OASW innately
Kai Ni Go	N/A	/ / / Any with 1+ ASW
	N/A	2 Autogyros -or- 1 Helicopter

See the list of Anti-submarine Weaponry and ASW Aircraft to better see what can help achieve OASW on a given ship.

Abyssals

Abyssal ships do not follow these rules. The following may perform OASW unconditionally:

• Destroyer Ha-Class Late Model Elite
• Destroyer Ni-Class Late Model Elite
• Light Cruiser Tsu-Class Flagship
• Light Carrier Nu-Class (Elite III, Elite IV, all Kai Elite, all Kai Flagship)
• Ancient Destroyer Princess II
• Seaplane Tender Water Princess (all variants)
• Abyssal Kuriles Princess (all variants)
• Destroyer Forest Princess (Damaged variants unconfirmed)
• American Destroyer Princess (most variants)

Other abyssals cannot perform OASW.

ASW Support Expedition

See ASW Support Expedition

• If a CVL is present, aircraft with ASW will attack submarines regardless of the ship on which it's equipped.