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Special Type 4 Amphibious Tank

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Type 4 Ka-Tsu
No.525 特四式内火艇
Special Amphibious Tank Icon.png Special Amphibious Tank
Effects: Torpedo+1 AA+1
Provides bonuses against installations
Affects various resources mechanics
Scrap value: Fuel 2 Ammo 2 Steel 4 Bauxite 6 (Unbuildable)

Equipment Card Special Type 4 Amphibious Tank.png

Equipment Character Special Type 4 Amphibious Tank.png

Equipment Item Special Type 4 Amphibious Tank.png

Equipment Full Special Type 4 Amphibious Tank.png

Refittable Ship Types
Fast Battleship Battleship
Aviation Battleship Standard Aircraft Carrier
Armored Carrier Light Carrier
Heavy Cruiser Aviation Cruiser
Light Cruiser Torpedo Cruiser
Training Cruiser Destroyer
Coastal Defense Ship Submarine
Aircraft Carrying Submarine Seaplane Tender
Fleet Oiler Submarine Tender
Repair Ship Amphibious Assault Ship



This is an amphibious combat vehicle developed by the Japanese Navy during "Operation Tatsumaki", equipped with torpedoes and guns, and prepared to attack aircraft carriers anchored in atolls, the "Special Type 4 Amphibious Tank", commonly known as Ka-Tsu.
It was originally developed as an amphibious transport vehicle.
In reality, there were fatal flaws with mobility and noise, and the operation was canceled.
This what if variant has been greatly improved based on the feedback of the operational team, so please make good use of the surprise attack!


Special Type 4 Amphibious Tank is an Amphibious Vehicle Amphibious Vehicle:

  • It deals adequate damage against installations, being a good component for "nukes" (see Anti-Installation).
  • It also allows Submarines to participate in the shelling phase against Installations, by launching the tank in battle.
  • It has an extra bonus against PT boats.

Uniquely on "Atoll Nodes", it is possibly to deploy the Amphibious Vehicle Ka-Tsu tanksSpecial Type 4 Amphibious Tank
Special Type 4 Amphibious Tank Kai
to trigger a special Opening Torpedo Salvo.

  • On those nodes, regular oTorp will not work,
  • This can only be deployed by SS, SSV, and the AV Mikuma Kai Ni Toku, Nisshin A, and Mizuho Kai fast,
    • They must carry at least one Ka-Tsu tank,
  • On the "atoll node", ships meeting those requirements will carry out a special opening torpedo attack,
  • In night battle, those ships will additionally trigger the same attack as a cutin,
    • This attack overrides regular Night Cut-ins attacks (e.g. if a ship is setuped for a TCI, it will still trigger the Ka-Tsu attack).
  • Using several Ka-Tsu tanks on a same ship will make it carry out several of those attacks in a row (day and night),
    • It capped at 2 attacks per ship at night.
    • This attack utilizes a new special animation, with the tank climbing the atoll's soil.

Can be equipped in the RE of I-36, I-41, I-47 Kai, and I-58 Kai.


This equipment is often referred to by its official Japanese name "Ka-Tsu".

Not to be confused with other "Landing Equipment/Tanks" (see here).

How To Obtain

Upgradeable from: Special Type 2 Amphibious TankSpecial Type 2 Amphibious Tank

Event reward for:

  • Early Spring 2024 Event
    • E-1: Hard (★+1), Medium (x2, ★+1), Easy (x2), Casual
    • E-2: Hard (★+3), Easy (★+1), Casual

Updates History

  • 2024-03-01: Implemented

Fit Bonuses

Special Type 4 Amphibious Tank Equipment Bonuses
Ship Extra Requirement Firepower Torpedo Attack Anti-Air Anti-Submarine Warfare Line of Sight Armor Accuracy Evasion Note
All SS
(★0) +1 +2 -1
(★1-2) +1 +3 -1
(★3-5) +1 +3 +1 -1
(★6-9) +1 +3 +2 -1
(★MAX) +1 +4 +2 -1
I-36 (any)I-36
I-36 Kai

I-41 (any)I-41
I-41 Kai
(1st equipped) +2 +1 +2 One-time[1]

In-game displayed values are bugged, this table shows the corrected values. See Display Bugs for details.


Improvement Improved effects
Amphibious Vehicle 1★ 2★ 3★ 4★ 5★ 6★ 7★ 8★ 9★ Max★
Firepower 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16
Night Battle Power 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16
Accuracy Day 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16
Accuracy Night 1.30 1.84 2.25 2.60 2.91 3.18 3.44 3.68 3.90 4.11
A1 1 + (Average Improved /50)
C [1 + (Average Improved /50)]N
Expedition Bonus 1 + (Average Improved /100)
Has some observed bonus on some special Resource Nodes gains

See Also