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"Sector 1" may also refer to Sector 1 / Biosphere.
Sector 1 (SRX) is a sector of the Biologic Space Laboratories research station in Metroid Fusion. It is here that Samus Aran fights the Fake Chozo Statue and Neo-Ridley, and explores it at the beginning of her mission and at the end. Most of the sector is rocky with a few plants, with one area filled with lava, all reminiscent of SR388 itself, as this sector is meant to imitate the planet. There is also a Tourian-like part of the sector where Neo-Ridley is fought. Adam reveals that the sector's main purpose is for the Metroid Breeding Program (creating an environment similar to the Metroids' homeworld that allowed them to molt naturally and reach the Omega level rapidly using an unknown formula).
- Alpha Metroid (shell left by Omega Metroid)
- Atmospheric stabilizer
- Elephant Bird
- Gamma Metroid (shell left by Omega Metroid)
- Gold Space Pirate
- Metroid (shells from different stages of life cycle left by Omega Metroid)
- X Parasite
- X Spawn
- Zeta Metroid (shell left by Omega Metroid)
- The main theme of Sector 1 has been remixed twice. The first time is in an arranged medley of Fusion's themes in the Metroid Prime & Fusion Original Soundtracks. The second time was in Super Smash Bros. Brawl as a theme available on the Frigate Orpheon. The same theme was later used on the Pyrosphere stage in Super Smash Bros. for Wii U.
- This is the only area in the game that does not contain a Data Room.
- Sector 1 seems to suggest the identity of the dangerous liquid on SR388 as being Lava instead of Acid, as the volcanic substance can be found in the SR388 replicating environment of the sector. However, this is relatively near Sector 3, the superheated area of the BSL station, leading to the theory that Sector 3's lava may have breached into SRX.
- This sector, despite being a replication of SR388, contained very few bioforms native to SR388. This can be explained by the near (if not total) destruction of the planet's ecosystem by the X Parasites and possibly Metroids (given the latter's dangerous nature), making Galactic Federation Researchers' task of collecting varied specimens from SR388 a difficult one.
- Part of this sector leading up to Neo-Ridley is very similar to Tourian. This makes it similar to Sector Zero on the BOTTLE SHIP, which was also designed to replicate Tourian. Like Sector Zero, the Tourian-like area was probably meant for Metroid propagation. Sector 1 was not known to have a Mother Brain replica, however.
"This sector reproduces the environment of planet SR388."
SECTOR 1 MAP
"Sector 1 was designed to recreate the environment on planet SR388, the native habitat of the X Parasite. Since the explosion, however, Parasites have contaminated the Sector's atmospheric stabilisers. One of Samus's first missions is to bring the stabilisers back online."
SECTOR 1 (SRX)
"The atmospheric stabilisers in Sector 1 have been taken over by X Parasites. As a result, the ecosystem is thick with fumes."