Sector 3 (PYR)
Samus first visits PYR in order to download the data for the Super Missiles. She is unable to enter some of the superheated rooms at first due to her not having the Varia Suit. After acquiring the Super Missiles, Samus battles Security Robot B.O.X..
Samus later visits PYR after acquiring the Ice Missiles in Sector 5 (ARC), after an X had deactivated the cooling unit. She had to make it to the Main Boiler Control Room before the excess heat caused the station self destruct mechanism to detonate.
- Sector 3 (PYR) is the only place on the B.S.L Research Station that does not have any enemies at first. Samus must deactivate the Level 2 Doors in order for enemies to inhabit it.
- "And avoid the ultra-heated areas: your suit can't take such high temperatures yet, but we're working on it." —Adam Malkovich (Metroid Fusion)
- "It seems the Main Boiler's cooling unit is malfunctioning. This could easily destroy the entire research station, as it would likely trigger the auto-destruct explosives." —Adam Malkovich (Metroid Fusion)
- "This sector is used to research creatures living in extremely hot habitats." Metroid Fusion Instruction Booklet, Pg 26