Arsenal Gear was a giant battleship introduced in Metal Gear Solid 2: Sons of Liberty. It was developed by the U.S. Navy and was a target of several characters. Its interior sections are mainly named after parts of the body, including the ascending colon, stomach and rectum. It contains a replica of the cell where Snake was held captive by Revolver Ocelot in Metal Gear Solid, along with large hangars for its complement of Metal Gear RAYs. It was submersible and was disguised by Big Shell. While Arsenal Gear looked formidable, Solidus pointed out that it lacked the compatibility for support needed to make it a useful weapon. Solidus was so confident in its uselessness that he claimed he would have given the weapon to Dead Cell when he had no further reason to use it. However, at a suggestion from Ocelot (on instructions from Solidus), Fortune planned to hijack Arsenal. The guards of the weapon were under the command of Olga Gurlukovich, equipped with Tengu armour which enhanced their agility.
Raiden first arrived after being captured by Olga and Ocelot. Snake used him as bait to gain access to the weapon. After being freed, Raiden found Snake and they fought off many Tengus. Shortly afterward, Snake fought Fortune while Raiden fought the mass-produced Metal Gear RAYs.
After facing off against its RAY guards, Raiden was knocked unconscious by Solidus. Soon afterward, Ocelot revealed that the vessel was ascending. It raced under the Verrazano Bridge and charged straight into Manhattan. This was not shown in the game; the cut-scene was removed after the September 11th attacks on the real Manhattan. However, it was shown having crashed into Federal Hall, where Raiden and Solidus fell from it and fought the final boss battle of the game.
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