Containment shield

The Containment Shield is a shield wall in Halo 2 on the level Sacred Icon. It helped contain and enclose the Flood inside the Quarantine Zone, and keep out anything that could sustain the Flood. It also appears to be a sort of energy field that doesn't allow anything through either way. It had to be lowered and deactivated in order for the Arbiter to enter the Library and recover the Icon. In order the lower the containment field, the Arbiter fought his way through the Sentinel defenders, deactivating the generators for the shield. However, the generator couplings were protected by a Sentinel Enforcer. After destroying the enforcer, the Arbiter deactivating the shield. This allowed access to the Quarantine Zone by the Covenant and the UNSC, giving the flood hundreds of new hosts. The Flood was released onto the rest of Installation 05. As a result of this the UNSC In Amber Clad was taken over by the Flood and flown into the Covenant City of High Charity.