Useful Spider

Useful Spider (営巣部隊(ユースフルスパイダー)) is an unit from Academy City's Disaster Recovery Committee, tasked with rebuilding the city following a major crisis.

Principles
A unit under Academy City's Disaster Recovery Committee, Useful Spider's purpose is to rapidly rebuild Academy City and restore order following a major disaster which has caused city-wide devastation. Once the primary danger is past, Useful Spider mobilizes to restore the city's infrastructure within a set time period. During such a period, such as the 48 Hours to Restore Order (秩序回復の四八時間) following the Elements and December heat wave, Useful Spider operates on special authority which allows them to temporarily rescind human rights to secure dangerous individuals or items, and carry out supposedly non-lethal suppression.

Useful Spider makes use of vehicles described as half trucks, with large beds on their backs. The front and rear wheels are powered in different ways; the rear wheels made into steel treads and the front wheels resembling countless insect legs wriggling around and digging to crawl or climb forward, working differently but moving in a way similar to the mouth of an ammonite or nautilus. The exposed truck bed has large speakers attached, as well as gun turrets equipped with high-pressure water cannons for suppression purposes. They also use helicopters, equipped with speakers and spotlights, armed with heavy machine guns positioned just inside the side cargo doors, and liquid (possibly water or gelatin) for suppression via drops.

Useful Spider also has a large number of 50cc AT carts, the size of one-person sofa, which can be used to set up a motor sharing service to aid the transportations of people and supplies.

Useful Spider's headquarters is located in the mountainous School District 21, hidden under a large-scale meteorological observatory, which can predict coming disasters. The observatory has a Doppler radar dome on top, as well as thick electromagnetic shielding to protect staff and equipment from microwaves.

Sphere
The Sphere (スフィア) is an information device distributed by Useful Spider.

During the '48 Hours to Restore Order', Useful Spider supplied a Sphere to the shelters in the city, including Trial (裁判) (School District 7), Academy (学会) (School District 5), Charity (博愛), Prison (監獄), Health (健康), Journalism (報道), Show Business (芸能) (District 7), Hospital (District 7) and Esper.

Breath of Blessing
The Breath of Blessing (ブレスオブブレッシング) is a giant fan used by Useful Spider for suppression and clearing purposes. The fans are giant cylinders about 20-30 meters wide, carried from helicopters by wires, of the class used in wind tunnel experiments to simulate wind speeds at Mach 7, and capable of blowing down reinforced concrete and small buildings.

The fans were originally designed to designed to artificially alter wind direction and redirect toxic smoke away from densely populated areas in the event of a dangerous chemical fire in one of the city's laboratories, however this nonlethal firefighting usage was largely an excuse for paperwork.

48 Hours to Restore Order Arc
On December 9th, following the end of the heat wave and the destruction of the Elements, Useful Spider were mobilized and distributed Spheres to the various shelters across the city, declaring the start of '48 Hours to Restore Order'. Through the manipulations of Kihara Yuiitsu and the Kamisato Faction, they also declared Kamijou Touma and Karasuma Fran as wanted figures linked to the disaster. The Spheres were used by the faction to manipulate the actions of the shelters' residents.