GAT-X255 Forbidden Blue


Model number: GAT-X255
Code name: 
Forbidden Blue
Unit type:
 prototype amphibious mobile suit
Manufacturer: Earth Alliance
Operator: Earth Alliance
First deployment: C.E. 71
Accommodation: pilot only, in standard cockpit in torso
Dimensions: unknown
Weight: unknown
Armor materials: unknown
Powerplant: ultracompact energy battery, power output rating unknown
Propulsion: “Geschmeidig Panzer” energy deflection armor
Equipment and design features: IR sensors, range unknown; sonar, range unknown; Lorenzini sensors, range unknown; ultra-low-light cameras; TP (Trans-Phase) armor; “Geschmeidig Panzer” energy deflection armor; tail extension (mounts ultra-long-wave antenna; towed sonar array; anchor)
Fixed armaments: phonon maser cannon, mounted on backpack, operable only in close combat mode; 2 x supercavitating torpedo canister pod, mounted on main body; 4 x close combat spike, mounted on shields; 2 x “Igelstellung” 75mm multi-barrel CIWS, mounted in head; 2 x “Armfeuer” 115mm machine gun, mounted on forearms
Optional hand armaments: trident

Throughout the course of the Bloody Valentine War, ZAFT fielded several amphibious mobile suit designs. Instead of creating a dedicated amphibious suit, the Earth Alliance modified the design of the GAT-X252 Forbidden Gundam into the GAT-X255 Forbidden Blue. Like the original Forbidden Gundam, the Forbidden Blue was equipped with Trans-Phase armor, which activated upon impact to conserve energy. It was also equipped with the same “Geschmeidig Panzer” energy deflection armor, which it used to move through water and counteract water pressure. However, because the Forbidden Blue relied on this system, it would be crushed if it lost power in deep water, earning it the nickname “Forbidden Coffin.” That design error was later corrected in two other units, the GAT-706S Deep Forbidden and GAT-707E Forbidden Vortex.

The Forbidden Blue carried a variety of sensor and sonar systems, including a tail equipped with a long-range antenna, sensor array and towing canister. Most of the original Forbidden Gundam’s armaments were replaced with new weapons designed for underwater use. The Forbidden Blue mounted a phonon maser cannon, two pairs of shield-mounted combat spikes, head-mounted CIWS guns, torpedo launchers, a pair of arm machine guns and a trident. The Forbidden Blue was tested by ace pilot Jane Houston. After the war, Jane was sent to South America to fight her former lover, Alliance defector Edward Harrelson. However, after a brief fight with Edward’s GAT-X133 Sword Calamity, the two reconciled.

Pilot: Jane Houston
First appearance: Mobile Suit Gundam SEED MSV
Original mechanical designer: Kunio Okawara




Rear view (Normal mode)


Supercavitating torpedo canister pod


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