Latest revision as of 19:40, 6 April 2024

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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 setups", requiring instead specific Anti-Submarine Warfare (ASW) equipment and setups in order to be sunk.

During sorties, submarines are typically found at pre-boss nodes, but some can be boss themselves, see here.

Attack Behavior

Unlike regular surface ships, submarines:

Cannot be targeted by normal shelling attacks,
Are immune to air and torpedo attacks,
Cannot take more than scratch damage during night battle,
- Therefore they cannot be sunk at night,
- The exception to this rule is when a battle starts at night, or when attacking with a Combined Fleet.

ASW Shelling Conditions

Only certain ships meeting certain conditions can attack SS(V).

Most often, if a ship can attack a submarine, focusing it will take over any other target.

Here, refers to any /.

Ship	Conditions		Day Battle	Night Battle
Ship	Stats	Equipment	Day Battle	Night Battle
Taiyou-class Kai Ni Kaga Kai Ni Go	Not more than moderately damaged (中破)	with 1+^[1]^[2]	Prioritize SS	Night Air Attack will prioritize surface target^[3] Night Shelling prioritizes SS
Gambier Bay Mk.II				Cannot attack SS unless if: setuped for a Night Air Attack, then prioritize SS with a night shelling attack
All other CVL				Do not attack SS
Mogami-class Kou Kai Ni			Prioritize surface target^[4]
BBV, CAV, AV, LHA	None	Equipped with Bomber, , , , or with 1+^[2]	Prioritize SS
Fusou-class Kai Ni No.101 Transport Ship		Equipped with	Prioritize SS
Any CV, CVL, BBV, CAV, AV, LHA		Not equipped with the above-mentioned equipment	Do not attack SS
Hayasui Kai Yamashio Maru Kai		Equipped with ^[2]	Prioritize SS	Do not attack SS
Hayasui Kai Yamashio Maru Kai		Not equipped with	Prioritize SS
All other ships	At least 1 base ASW^[5]	None	Prioritize SS
All other ships	No base ASW	None	Do not attack SS

↑ A 0 attack plane paired with a Rotorcraft or a Liaison Aircraft do work
↑ ^2.0 ^2.1 ^2.2 If all relevant aircraft are in zero plane slots, the ship cannot attack SS.
↑ In absence of surface target will do a night shelling against SS
↑ Can still attack SS
↑ Here base also include ASW gains from ASW modding (only relevant for Yamato Kai Ni so far), excepted for Kaga Kai Ni/E.

Notes

As Abyssals also follow those conditions, SS/V can be used as "Submarine Tanks" (Sub-tanking) on some maps to deviate attacks from the fleet to the submarine.

Damage Calculation

The stats used to calculate damage against submarines is the ASW.

When contributing to ASW power, Base ASW is square rooted, while equipment ASW is multiplied by 1.5.
- Anti-submarine weaponry is therefore the primary source of ASW damage, with the base ship ASW playing a very minor role damage-wise.
- However, base ship ASW is the primary determinant of whether a ship can reach 100 total ASW to perform "Opening ASW" (OASW) attacks.
Unlike shelling, ASW damage is capped at 170.

ASW attacks have different modifiers gained from Formations,

Line Abreast is the main ASW formation, with a 1.3x damage modifier,
Cruising Formation 1 is the main ASW formation for Combined Fleets, with a 1.3x damage modifier.

Anti-Submarine Formula

[math]\displaystyle{ \text{Atk}_\text{base ASW} = \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]

With

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

Ship Type Constant
Ship Types	[math]\displaystyle{ \text{Type}_\text{ship} }[/math]
Coastal Defense Ships (DE) Destroyers (DD) Light Cruisers (CL/CT) Oilers (AO) (without carrier bomber)	13
Aviation Cruisers (CAV) Aviation Battleships (BBV) Seaplane Tenders (AV) Light Carriers (CVL) Landing Ships (LHA) Oilers (AO) (with carrier bomber)	8

[math]\displaystyle{ \text{Mod}_\text{synergy} }[/math] the synergy multiplier bonus from using certain combinations of ASW equips (see below).

Notes

The bonuses do not stack, meaning only the highest possible bonus applies.
- The exception is the depth charge penetration detailed above.
Multiple equipments 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.

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

Large + DCP + DCR

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.

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^[1]	Equipment Required^[2]^[3]^[4]
Any DD, CL, CLT, CT, AO^[5]	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^[6]		+ / / / 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
Any DE	75+ ASW	Total of 4+ ASW from equipment
Kai Ni D Fletcher-class^[7] 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

↑ The Required ASW Stat does include Visible Bonuses, but does not include Improvements.
↑ Visible Bonuses or Improvements do not count as equipment ASW (e.g. a +6 ASW equipment with +1 ASW bonus does not count as a +7 equipment but just as a +6 one).
↑ When applicable, if all relevant ASW aircraft are in zero plane slots, and no bomber / with 1+ are present in non-zero plane slot, the ship cannot OASW.
↑ Regardless of their ASW stat, Fighters or Carrier Recons cannot trigger any OASW.
↑ Other ASW Shelling capable ships may be able to OASW, but cannot reach 100 ASW using currently available equipment.
↑ CVE should be used, as they are the only CVL with base ASW stat.
↑ Kai only for Heywood L. Edwards.

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)

Other abyssals cannot perform OASW.

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.

ASW Aircraft
Rotorcraft	Autogyros	Ka Type Observation Autogyro O Type Observation Autogyro Kai O Type Observation Autogyro Kai Ni
Rotorcraft	Helicopters	S-51J S-51J Kai
Liaison Aircraft		Type 3 Command Liaison Aircraft (ASW) Type 3 Command Liaison Aircraft Kai Type 1 Fighter Hayabusa Model II Kai (20th Squadron) Type 1 Fighter Hayabusa Model III Kai (Skilled/20th Squadron)
Land-based Patrol Aircraft		Prototype Toukai Toukai (901 Air Group)
+7 ASW Torpedo Bombers		Type 97 Torpedo Bomber (931 Air Group) Type 97 Torpedo Bomber (931 Air Group/Skilled) Tenzan (931 Air Group) Prototype Type 97 Torpedo Bomber Kai (Skilled) No. 3 Model E (w/ Type 6 Airborne Radar Kai) Tenzan Model 12A Kai (Skilled w/ Type 6 Airborne Radar Kai) Ryuusei Kai (CarDiv 1/Skilled) Swordfish Mk.III (Skilled) Barracuda Mk.III TBM-3D TBM-3W+3S
+7 ASW Dive Bombers		Ju 87C Kai Ni (w/ KMX) Ju 87C Kai Ni (w/ KMX/Skilled) Type 0 Fighter Model 64 (Two-seat w/ KMX)
+7 ASW Seaplanes	Recons	Type 0 Reconnaissance Seaplane Model 11B Type 0 Reconnaissance Seaplane Model 11B (Skilled)
+7 ASW Seaplanes	Bombers	Swordfish Mk.III Kai (Seaplane Model) Swordfish Mk.III Kai (Seaplane Model/Skilled) Zuiun Kai Ni (634 Air Group/Skilled)

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.

@@ Line 13: / Line 13: @@
 **The exception to this rule is when a battle starts at night, or when attacking with a [[Combined Fleet]].
-===ASW attack conditions===
+===ASW Shelling Conditions===
-Only certain ships meeting certain conditions can attack SS(V).
+{{/Shelling Conditions}}
-*Here, {{AnyBomber}} refers to any {{RedPlane}}/{{BluePlane}}
-{|class="wikitable"
-!Ship!!Condition!!Day Battle!!Night Battle
-|-
-|{{Ship/Link|Taiyou Kai Ni|Shinyou Kai Ni|Unyou Kai Ni|text=''Taiyou''-class Kai Ni|link_class=Taiyou}}<br>{{Ship/Link|Kaga Kai Ni Go}}
-|rowspan=4|Not more than {{color|orange|'''moderately damaged (中破)'''}}<br>Have an {{AnyBomber}} with 1+{{ASW}}<ref>A 0{{ASW}} attack plane paired with a [[Rotorcraft]] {{Autogyro}} or a [[Liaison Aircraft]] {{ASWPlane}} do work</ref>
-|rowspan=3|Prioritize SS
-|[[Combat/Night_Battle#Trigger Requirements|Nigth Air Attack]] will prioritize surface target<ref>In absence of surface target will do a night shelling against SS</ref><br>Nigth Shelling prioritize SS
-|-
-|{{Ship/Link|Gambier Bay Mk.II}}
-|Prioritize SS (with a special night air attack)
-|-
-|All other [[CVL]]
-|rowspan=4|Do not attack SS
-|-
-|{{Ship/Link|Suzuya Kou Kai Ni|Kumano Kou Kai Ni|text=''Mogami''-class Kou Kai Ni|link_class=Mogami}}
-|Prioritize surface target<ref>Can still attack SS</ref>
-|-
-|{{Ship/Link|Hayasui Kai}}<br>{{Ship/Link|Yamashio Maru Kai}}
-|Equiped with {{AnyBomber}}
-|rowspan=2|Prioritize SS
-|-
-|[[BBV]], [[CAV]], [[AV]], [[LHA]]
-|{{SPB}}, {{Autogyro}}, {{Large Flying Boat}}, {{AnyBomber}} with 1+{{ASW}}
-|-
-|{{Ship/Link|Hayasui Kai}}<br>{{Ship/Link|Yamashio Maru Kai}}
-|Not equiped with {{AnyBomber}}
-|colspan=2 rowspan=2|Prioritize SS
-|-
-|All other ships
-|At least 1 base {{ASW}} ASW
-|}
-<references/>
-==Damage calculation==
+==Damage Calculation==
 <onlyinclude>The stats used to calculate damage against submarines is the {{ASW}} ASW.
-*When contributing to ASW power, Base {{ASW}} ASW is '''square rooted''', while equipment ASW is '''multiplied by 1.5'''
+*When contributing to ASW power, Base {{ASW}} ASW is '''square rooted''', while equipment ASW is '''multiplied by 1.5'''.
 **[[:Category:Anti-submarine Weaponry|Anti-submarine weaponry]] is therefore the primary source of ASW damage, with the base ship ASW playing a very minor role damage-wise.
 **However, base ship ASW is the primary determinant of whether a ship can reach 100 total ASW to perform '''"[[#Opening ASW Shelling (OASW)|Opening ASW]]"''' (OASW) attacks.
-*Unlike sheeling, ASW damage is capped at 170.
+*Unlike shelling, ASW damage is capped at 170.
 ASW attacks have different modifiers gained from [[Formation]]s,
 *{{ToolTip|[[Combat#Formation_Selection|Line Abreast]]|[[File:LineAbreast.png]]}} is the main ASW formation, with a 1.3x damage modifier,
 *{{ToolTip|[[Combined_Fleet#Formation_Selection|Cruising Formation 1]]|[[File:Formation_1.png]]}} is the main ASW formation for [[Combined Fleet]]s, with a 1.3x damage modifier.
-{|class="wikitable mw-collapsible mw-collapsed" width="100%"
+{{Formula
-!Anti-Submarine
+|Title=Anti-Submarine Formula
-|-
+|Math=\text{Atk}_\text{base ASW} = \left( 2\sqrt{\text{ASW}_\text{ship} } + 1.5\text{ASW}_\text{equip} + \bigstar + \text{Type}_\text{ship} \right) \times \text{Mod}_\text{synergy}
-|'''Pre-cap:
+|Var=<math>\text{Type}_\text{ship}</math> a constant depending on the type of the ship performing the attack. See below for details.
-*<math>\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>
+{{{!}}class="wikitable mw-collapsible mw-collapsed" style="text-align:center; margin:auto"
+!colspan=2{{!}}Ship Type Constant
-'''With:
+{{!}}-
-*<math>\text{Type}_\text{ship}</math> a constant depending on the type of the ship performing the attack. See below for details.
-{|class="wikitable mw-collapsible mw-collapsed" style="text-align:center; margin:auto"
-!colspan=2|Ship Type Constant
-|-
 !Ship Types
 !<math>\text{Type}_\text{ship}</math>
-|-
+{{!}}-
-|Coastal Defence Ships ([[DE]])<br>Destroyers ([[DD]])<br>Light Cruisers ([[CL]]/[[CT]])<br>Oilers ([[AO]]) (without carrier bomber)
+{{!}}Coastal Defense Ships ([[DE]])<br>Destroyers ([[DD]])<br>Light Cruisers ([[CL]]/[[CT]])<br>Oilers ([[AO]]) (without carrier bomber)
-|13
+{{!}}13
-|-
+{{!}}-
-|Aviation Cruisers ([[CAV]])<br>Aviation Battleships ([[BBV]])<br>Seaplane Tenders ([[AV]])<br>Light Carriers ([[CVL]])<br>Landing Ships ([[LHA]])<br>Oilers ([[AO]]) (with carrier bomber)
+{{!}}Aviation Cruisers ([[CAV]])<br>Aviation Battleships ([[BBV]])<br>Seaplane Tenders ([[AV]])<br>Light Carriers ([[CVL]])<br>Landing Ships ([[LHA]])<br>Oilers ([[AO]]) (with carrier bomber)
-|8
+{{!}}8
-|}
+{{!}}}
 *<math>\text{Mod}_\text{synergy}</math> the synergy multiplier bonus from using certain combinations of ASW equips (''see below'').
-*The bonuses do not stack, meaning only the highest possible bonus applies.
+|Notes=The bonuses do not stack, meaning only the highest possible bonus applies.
 **The exception is the depth charge '''penetration''' detailed above.
 *Multiple equipments 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.
-|}
+}}
+</onlyinclude>
 {{Equipment/ASW_Synergy|expand=true}}
-</onlyinclude>
 ==Opening ASW Shelling (OASW)==
 {{:Combat/Battle Opening}}
-==Equipment Set Up==
-Are listed here some recommended equipment setups for ASW duties. ''The equipment order is illustrative and does not reasonably matter.
-As general rules:
-*The first priority is to have OASW, even at the expense of synergy:
-**[[DE]] can OASW more easily than [[DD]],
-**Because {{ASW}} increase with levels using high-level ships can help,
-**Take note that DEs have bonus armor penetration from Depth Charges.
-*To further maximize ASW effectiveness, regardless if an OASW is triggered or not, it is recommended to use:
-**{{Small Sonar}} {{DCP}} {{DCR}}
-*When using carriers, it is recommended to use [[CVE]], as they have a base {{ASW}} stat.
-{|class="wikitable" width=100%
-!width=13%|Equipment
-!|Notes
-|-
-!colspan=2|[[DD]]/[[DE]]/[[CL]]/...
-|-
-|{{Small Sonar}} {{DCP}} {{DCR}}{{WildCard}}
-| This ASW setup maximizes the ASW by taking advantage of the synergy. One of the depth charges needs to be a [[DCR|Depth Charge Projector]] while the other needs to be a [[DCR|Depth Charge (Racks)]]. Take note that '''reaching the [[OASW]] threshold takes precedence over everything'''. So you should just replace depth charges with equipment that has better ASW if you cannot hit the threshold with this setup.
-|-
-!colspan=2|[[CVL]]/[[Kaga Kai Ni Go]]
-|-
-|{{BluePlane}}/{{RedPlane}}/{{Autogyro}}/{{ASWPlane}}/{{Sonar}}/{{DepthCharge}}
-|[[ASW aircraft]] or just planes with good ASW should be prioritized. It is possible to maintain some surface combat capabilities, by doing a normal CVCI with high ASW panes, or by stacking {{BluePlane}}.
-|-
-!colspan=2|Unique setup
-|-
-|{{RedGunHeavy}}{{RedGunHeavy}}{{Seaplane}}{{WildCard}}{{Autogyro}}
-|The {{Autogyro}} must be an '''{{EquipmentLink|S-51J|S-51J Kai|text=Helicopter|link_category=Helicopters}}''', and should be placed in the smaller plane slot when other planes are used.
-Setup unique to {{Ship/Link|Hyuuga Kai Ni}} which allows her to do an [[OASW]] with a decent base ASW, while keeping some surface combat capabilities like [[Artillery Spotting]].
-|}
 ==LBAS==
@@ Line 129: / Line 58: @@
 *Only [[ASW Aircraft|ASW Planes]] (7+ {{ASW}} 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.
-{{Category:ASW Aircrafts|expand=1}}
+{{Category:ASW Aircraft|expand=1}}
 ==ASW Support Expedition==
@@ Line 136: / Line 65: @@
 =See Also=
+*[[Help:Equipment Setup#Anti-Submarine|Anti-Submarine Setup]]
 *[[:Category:Anti-submarine Weaponry|ASW Equipment]]
+*[[Modernization#ASW Modernization|ASW Modernization]]
+*[[Partials/Opening ASW]]
 {{Mechanics}}

Difference between revisions of "Anti-Submarine Warfare"

Latest revision as of 19:40, 6 April 2024

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