A Metroid tank barrier is a special containment unit used by the Space Pirates during Metroid Prime 3: Corruption to successfully contain Phazon Metroids, which are normally able to break out of any form of containment. These red-colored barriers are more advanced than the Xenome Containment Units from Metroid Prime and Metroid Prime 2: Echoes, which were easily destroyed with weapons fire. Metroid tank barriers prevent the Metroids from breaking free by exploiting their alternate weakness to sound frequencies by emitting a high-frequency pitch that renders them docile. They are seen in the Metroid Processing room on the Pirate Homeworld, in the Research Facility.