ARC Main Plaza

The ARC Main Plaza is a room onboard the Biologic Space Laboratories in Metroid Fusion.
==Description==
A large Sub-Zero contained room built inside Sector 5 (ARC). The room housing many doors that lead to other portions of Sector 5, serving as the main plaza that connects these facilities together. This room is mandatory to visit as it links to important facilities such as the Data Room. This room is the only room in Sector 5 to contain a Level 4 Security Hatch, which ultimately leads to Sector 4 (AQA), a sector that houses further Level 4 Hatches and its accompanying Security Room.
Samus can first enter this room once the Level 2 Security Hatches are unlocked. However, it is strongly advised to withhold entering this sector immediately: being the first room in Sector 5 to contain heavy sub-zero environments, the moment Samus steps foot inside the room, her energy will deplete rapidly and constantly knock her back as a result, preventing her from properly exploring the rest of the sector without the Varia Suit. Without the Speed Booster, Samus can only enter an adjacent Sub-Zero room to the west, the security hall below the Level 4 Hatch (which isn't a sub-zero room, acting as a minor safe spot), or the large unfrozen room she first entered this room from.
Samus eventually treks through this room after obtaining the Varia Suit from Sector 6 (NOC). A Blue X and Waver reside near the initial top-west entrance as a means to greet her arrival. Upon entering this room, the Sector 5 (ARC) Low-Temperature Zone Area theme will play throughout Samus's exploration within Sector 5. Samus needs to make use of the Speed Booster using this room and the adjacent West Exit Hall in order to reach the lower levels of the ARC Main Plaza. Samus returns to this room multiple times: the first return trip is to reach the Data Room for the Ice Missile upgrade. the second time is right after detouring around the Data Room. This time she discovers a hidden shortcut around this room's Speed Booster Block floor, as she makes her way back to a Navigation Room. Samus eventually returns to this room for a repeat third and fourth time in order to obtain the Power Bomb data and escape the Sector with it respectively.
After exploring regions outside of ARC and obtaining the Plasma Beam as a result, the Computerized CO. informs Samus of a released creature being originally stored in Sector 5 know as the Nightmare, specifically in the room adjacent to the ARC Main Plaza. Samus searches for the escapee and sees its destruction of the Sector it left behind. Because of this room's vicinity to Nightmare's containment room, the ARC Main Plaza is one of the rooms thrashed by its rampage. The creature rips open the connecting door between these two rooms and tears apart the entire upper path leading to the Level 4 Security Hatch, in which it rips that door completely wide open. The damage Nightmare leaves behind leaves the room's cooling units to malfunction, causing this room to no longer produce sub-zero temperatures. This causes all of the ice to melt and eventually flood the lower-half of the room. On first visit of the ruined room, Samus is unable to explore much of the flooded elevation due to her being unable to use the Speed Booster whilst running underwater. With the West Exit Hall's Shutter blocking further access to Sector 5, Samus's only option is to follow the path of destruction. She can either enter the next room through the destroyed Level 4 Hatch, or she can enter the Data Room, which also ends up destroyed during Nightmare's escape. With this current room's state, the X Parasites appear to adjust and adapt to this room's new layout by forming as water creatures; the previous room's enemy layout no longer exists (save for a large Geron, which will only remain if Samus never took the time to eliminate it prior to the room's flooding). Despite some doors in the ARC Main Plaza being underwater, their respective connecting rooms do not appear flooded at all.
==Connecting Rooms==
===Initial===
*ARC Main Storage vault (via Level 0 Gray Hatch)
*North service hall (via Level 4 Red Hatch, unopenable pre-Nightmare's release.)
*Data Room access hall (via Level 0 Gray Hatch)
*Sub-Zero Storage Hall (via Gray Hatch, blocked by a one time large Geron)
*West Exit Hall (via Level 0 Gray Hatch)
===After Nightmare's Escape===
*ARC Main Storage vault (via empty door)
*Sub-Zero Storage Hall (via empty door)
==Inhabitants==
===Initial===
*Blue X Parasite
*Wavers
*1 Large Geron (only one)
===Post-Nightmare's rampage===
*3 Aqua Zebesian
*3 Skultera (small)
*1 Large Geron (if not previously destroyed)
==Gallery==
ARC Main Plaza (Post-Destruction).png|Full room, post Nightmare's escape.
Waverx.png|Samus confronts X infected Wavers.