Level 4 warning



A Level 4 warning is a security protocol alluded to in Metroid: Other M. The Bottle Ship P.A. Announcer states that it is in effect in the Pyrosphere and Cryosphere. In the latter instance, the announcer advises that the inhabitants of the Bottle Ship wear protective equipment and use extreme care when moving around due to an irregularity in the climate-control systems. In the former instance, the announcer asks personnel to evacuate the sector immediately due to irregularities in the Geothermal Power Plant and experimental simulated desert area.

A lesser Level 3 warning is in effect in the Biosphere.