Underground Sector 4.

Sector 4 is a location on the Planet in the Compilation of Final Fantasy VII. It is one of the eight sectors in Midgar, and is visited briefly by the party during the events of Final Fantasy VII. The locations visited in Sector 4 are unrevisitable and cannot be re-explored once the story has progressed beyond them.


Spoiler warning: Plot and/or ending details follow. (Skip section)

Underground Sector 4.

After the success of the Sector 1 Reactor bombing mission, AVALANCHE plan another mission on the Sector 5 Reactor. In the early hours of the morning after the first mission, they board a train for the Sector 4 Station. The train uses an ID scan system, making the fake IDs made by Jessie ineffective, and therefore the party plan to jump off the moving train into the train tunnel.

Unauthorized personnel are discovered on board prior to when the check was meant to happen due to modifications to the ID cards made by Jessie, meaning the party has to move down the train to the end cart before the lockdown. While Cloud's party jumps off the train, Biggs, Wedge, and Jessie stay on board in disguises.

After moving down the railway, Cloud's party come to Shinra's security sensors and have to look for another way. The party crawl through a duct into the Lower Sector 4 Plate. As Cloud's party move through the plate, they find the rest of AVALANCHE have made it there safely. The others withdraw back to Sector 7 as Cloud and his party enter the Sector 5 Reactor.

Spoilers end here.


Winding Tunnel

Security sensors.


Multiple areas that look the same, there are six screens in total. the screen the player jumps off at depends on the point the player jumps off the train to Sector 4. Timing out in Car #1 has the player jump off at Tunnel 2, in Car #2 at Tunnel 3, in Car #3 at Tunnel 4, in Car #4 at Tunnel 5, and making it to the end leaves the player at Tunnel 6.

The southern most tunnel, Tunnel 1, leads to the danger area. The northern most tunnel, Tunnel 6, leads to the security sensors.

Security Sensors

North end of the tunnels, blocked by Shinra's security sensors. Exit through first duct to enter the Lower Sector 4 Plate.

Danger area.

Danger Area

South end of the tunnels. Shinra security guards are here. Choosing to stay will lead to an encounter against three Special Combatants, choosing to leave will move the player onto the next screen. This can be repeated indefinitely.

Lower Sector 4 Plate

First Duct

Moving through the duct takes the player to the ladder room. There is an Ether on the floor.



Moving down the ladder takes the player to the big room.

Big Room

Originally entered by going down the ladder from the ladder room. Ladder in the middle of the room leads to the crawl duct which leads to small room. The ladder on the right also leads to small room, and Wedge is standing by it. Wedge tells the player that the reactor is up the ladder he is standing by.

Small room.

Small Room

Connected to the big room via a crawl duct at the top of the screen. Also connected to the big room via a ladder in the bottom-right. Also connected to the exit by going down a ladder on the left. A Potion is across from Jessie in the top-right of the screen. Jessie tells the player that the ID scan problem was her fault as she modified Cloud's ID.

Crawl Duct

Connects the big room and the small room.


Connected to the small room via a ladder. There is a ladder to climb up through a vent and into the Sector 5 Reactor. Further passed the ladder is a Tent item and a save point. Biggs is by the ladder. Biggs tells the player that him and his party will withdraw to the hideout.


Path to Sector 5 Reactor

Sector 4 is only visited once after getting off the train to sector 4. The only goal here is to pass through the sector and reach the next reactor.

Enemy formations

Sector 4 Train Tunnel (All screens)

Battle background.

Lower Sector 4 Plate - First Duct and Small Room

Battle background.

Lower Sector 4 Plate - Ladder, Big Room and Exit

Battle background.




  • In the PlayStation translation of the game, the lines Jessie says are different from what she says in the PC version.
"The ID scan problem on the train
was all my fault."
"I made your ID card special...
So that's why it happened..."
"I put my heart into making it."
But I failed."
"The ID scan problem on the train
was all my fault."
"I modified your ID card...
And that's what did it..."
"I did my best...
But I failed."
—Jessie in the PlayStation version —Jessie in the PC version
  • In the scene showing Cloud and Zack right outside Midgar in Final Fantasy VII, the Midgar upper plate for Sector 4 is absent. While Crisis Core -Final Fantasy VII- states the Sector 4 plate is last on the schedule for completion, Final Fantasy VII shows it fully complete and in place, while Sector 6 is the sole sector still under construction as of the game's opening.


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