The Quarantine Bay is a room in the Main Deck of the Biologic Space Labs research station. The small bay's only function is to quarantine samples collected by Biologic researchers within capsules, presumably to be studied prior to being released into the specialized sectors of the research station.
The Quarantine Bay held capsules of Samus's infected suit parts some time before the X completely overtook the research station. Shortly after Samus had awaken with her newly acquired Fusion Suit, Samus heard, the Galactic Federation received a distress call from the B.S.L station saying that there was an explosion in the Quarantine Bay. Considering that Samus's suit parts were in the Quarantine bay, the explosion was probably caused by the SA-X, leaving the Quarantine Bay in ruins.
Samus responds to the distress signal and is guided by her Federation-assigned commanding officer to the Quarantine Bay to investigate. Upon her arrival, Samus finds a lone Hornoad which reveals an X upon its death. This is Samus's first encounter with an X since being infected herself.
Upon revisiting the Quarantine Bay, there are no more Hornoads or X of any kind, nor will there be any expansions.
The lone Hornoad in the Quarantine Bay
The most damaged of the capsules, likely the one holding the first SA-X
- "The Quarantine Bay is ahead. Bio-signs are confirmed. Be careful." —Adam Malkovich (Metroid Fusion)
- "There's been an explosion in the Quarantine Bay. The bay currently stores capsules containing recent samples from SR388 as well as parts of your suit infected by the X parasites. The cause of the explosion is yet unclear. Investigate. The Quarantine Bay is here. Move quickly and quietly..." —Adam Malkovich (Metroid Fusion)
- "When I woke, the scientists told me that the hatchling had saved me once again. Almost immediately after I awoke, we received a distress call from the research station. "Emergency! Explosion of the unknown origin in the Quarantine Bay!" The screams from the com receiver were loud enough for me to hear even in the infirmary. I knew that something terrible was about to happen... was already happening. I immediately boarded the ship the Federation had provided me and sent a reply message: "Docking with Biologic Space Labs station in 10 minutes. Prepare the landing bay!"" Metroid Fusion Instruction Booklet, Pg 10