Although generally publicized as the new
capital city to replace
New Tokyo-2, it is actually a
fortified city for intercepting the
Angels which was built in anticipation of
Angel attacks. However, the only real intercepting force is the
Eva, and the city mainly performs support functions. Towering
armoured buildings -- supporting facilities disguised as ordinary buildings -- stand clustered in the centre of the city. These buildings house the Eva
launch exits,
electric power supply, replacement
weapons and ammunition, and supporting
guns. There are also many intercepting weapons installations positioned around the city.
Underground the city is the expansive
Geofront, at the centre of which is located the headquarters of Special Agency
NERV. In episode 25', the city was first attacked by the
JSSDF, after which the Eva series were committed to the battle. This annihilated the entire combat capability of the city except for
Eva-01.
Source: The End of Evangelion : Glossary contained within The End of Evangelion - Theatrical Program.