Submarine Supply Materials are consumed to trigger the special "fleet submarine" attack.

The Submarine Touch is a Special Attack involving a submarine tender

leading a fleet of at least two submarines.

The flasgship must be a submarine tender (AS)

at Lv 30+,
- She must not be more than moderately damaged (中破).
Two among the 2nd, 3rd, and 4th ships must be Submarines (SS) or Aircraft Carrying Submarines (SSV),
- At least two SS(V) must not be more than lightly damaged (小破),
- If all 3 ships are SS(V), the 2nd and 4th ones will attack, if one of them is moderately damaged (中破), the 3rd one will attack instead.^[1]
The fleet can be a single fleet or a Striking Force Fleet,
The formation needs to be either Echelon or Line Abreast,
At least one Submarine Supply Material must be available in the inventory.

Two SS(V) will launch a torpedo strike.
- The number of attacks per Touch is random from 2 to 4.
The attack power is postcapped and unaffected by formation, engagement, nor damage cap.
A rough damage formula per Submarine attack is:
- [math]\displaystyle{ \text{DMG}_\text{day} = \text{TP} \times ( 1.2 + 0.04 \times \sqrt{LV} ) }[/math]
- [math]\displaystyle{ \text{DMG}_\text{night} = ( \text{FP + TP} ) \times ( 1.2 + 0.04 \times \sqrt{LV} ) }[/math]
- With:
  - [math]\displaystyle{ \text{DMG} }[/math] the damage result for day and night battle respectively,
  - [math]\displaystyle{ \text{FP} }[/math] the submarine's firepower stat,
  - [math]\displaystyle{ \text{TP} }[/math] the submarine's torpedo stat,
  - [math]\displaystyle{ \text{LV} }[/math] the submarine's level.
    - [math]\displaystyle{ 1.2 + 0.04 \times \sqrt{LV} = 1.6 }[/math] at Lv 100.

One Submarine Supply Material will be consumed for EACH battle the Touch triggers in.
- If the Touch triggers twice in a battle, only a single will be consumed for this battle.
- If the Touch triggers in multiple nodes, one will be consumed for each node it is triggered.
It does not consume any extra ammo.

It has a chance to trigger every time the AS takes a turn at shelling. If it fails to trigger during the day battle, there is a chance to trigger it in the follow-up night battle.
- It can trigger in both day and night for the same battle.
It can be activated multiple times per sortie.

Regular
Taigei Special Attack Taigei Special Attack Damaged Jingei Special Attack Jingei Special Attack Damaged Jingei Special Attack Kai Jingei Special Attack Kai Damaged Chougei Special Attack Chougei Special Attack Damaged Chougei Special Attack Kai Chougei Special Attack Kai Damaged
Seasonal
Taigei Summer 2021 Special Attack Taigei Summer 2021 Special Attack Damaged Jingei Summer 2021 Special Attack Damaged Jingei Summer 2021 Special Attack Chougei Summer 2022 Special Attack Chougei Summer 2022 Special Attack Damaged