View source for Anti-Submarine Warfare

{{CombatPortal}}

'''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 ''[[Enemy#Bosses (SS)|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|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===
{{/Shelling Conditions}}

==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'''.
**[[: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 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.

{{Formula
|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}
|Var=<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)
{{!}}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)
{{!}}8
{{!}}}
*<math>\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.
}}
</onlyinclude>
{{Equipment/ASW_Synergy|expand=true}}

==Opening ASW Shelling (OASW)==
{{:Combat/Battle Opening}}

==LBAS==
''See the [[Land-Based Air Squadron#Attack Power|Land-Based Air Squadron]] page
*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 Aircraft|expand=1}}

==ASW Support Expedition==
''See [[Support Expedition#Anti-Submarine Support|ASW Support Expedition]]
* If a CVL is present, aircraft with {{ASW}} ASW will attack submarines regardless of the ship on which it's equipped.

=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}}