Changes

* The flasgship must be a {{Ship/Link|Taigei|Jingei|Chougei|text=submarine tender|link_category=Submarine Tenders}} (AS) at Lv 30+,

* The flasgship must be a {{Ship/Link|Taigei|Jingei|Chougei|text=submarine tender|link_category=Submarine Tenders}} (AS) at Lv 30+,

** She must not be more than {{color|orange|'''moderately damaged (中破)'''}}.

** She must not be more than {{color|orange|'''moderately damaged (中破)'''}}.

* The 2nd and 3rd ships must be [[:Category:Submarines|submarines]] (SS/SSV)

* Two among the 2nd, 3rd, and 4th ships must be [[:Category:Submarines|submarines]] (SS/SSV),

** At least two [[:Category:Submarines|submarines]] must not be more than {{color|gold|'''lightly damaged (小破)'''}},

** At least two [[:Category:Submarines|submarines]] must not be more than {{color|gold|'''lightly damaged (小破)'''}},

** If the 4th ship is a [[:Category:Submarines|submarine]], she will also participate in the attack,

** If all 3 ships are SS(V), the 2nd and 4th ones will attack, if one of them is {{color|orange|'''moderately damaged (中破)'''}}, the 3rd one will attack instead.<ref>https://twitter.com/yukicacoon/status/1394879812968222721</ref>

* The fleet can be a single fleet or a [[Striking Force Fleet]],

* The fleet can be a single fleet or a [[Striking Force Fleet]],

* The formation needs to be either {{ToolTip|[[Combat#Formation_Selection|Echelon]]|[[File:Echelon.png]]}} or {{ToolTip|[[Combat#Formation_Selection|Line Abreast]]|[[File:LineAbreast.png]]}},

* The formation needs to be either {{ToolTip|[[Combat#Formation_Selection|Echelon]]|[[File:Echelon.png]]}} or {{ToolTip|[[Combat#Formation_Selection|Line Abreast]]|[[File:LineAbreast.png]]}},

* At least one {{Item/Link|Submarine Supply Material}} must be available in the inventory.

* At least one {{Item/Link|Submarine Supply Material}} must be available in the inventory.

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* Two [[:Category:Submarines|submarines]] will launch a torpedo strike.

* Two [[:Category:Submarines|submarines]] will launch a torpedo strike.

** The 2nd and 4th ship will attack, if one of them is {{color|orange|'''moderately damaged (中破)'''}}, the 3rd ship will attack instead.<ref>https://twitter.com/yukicacoon/status/1394879812968222721</ref>

** The number of attacks per Touch is random from 2 to 4.

** No additional inforamation is known yet.

* The attack power is postcapped and unaffected by formation, engagement, nor damage cap.

<references/>

* A rough damage formula per Submarine attack is:

**<math>\text{DMG}_\text{day} = \text{TP} \times ( 1.2 + 0.04 \times \sqrt{LV} )</math>

**<math>\text{DMG}_\text{night} = (\text{FP + TP}) \times (1.2 + 0.04 \times \sqrt{LV})</math>

**With:

***<math>\text{DMG}</math> the damage result for day and night battle respectively,

***<math>\text{FP}</math> the submarine's firepower {{Firepower}} stat,

***<math>\text{TP}</math> the submarine's Torpedo {{Torpedo}} stat,

***<math>\text{LV}</math> the submarine's level.

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