Sector 1, or SRX, is an artificially recreated habitat of SR388's main cave areas. The planet's unique climate is achieved using special atmospheric stabilizers spread throughout the Sector.
Adam puts you on a quest to fix the atmospheric stabilizers that have been infected by Gelon - a cluster of X whose purpose is to create a barrier or clog. There are five stabilizers in all. The infected stabilizers help the X proliferate, so it is important that Samus must destroy them or else the local wildlife will perish.