The Septic Tank is an "I" shaped passage, composed with septic tanks all around the room.
Resident Evil 2
The door at the top left side requires four plugs to unlocked. The four plugs are King Plug, Rook Plug, Bishop Plug and Knight Plug that can be found in various area such as Library, Interrogation Room A, Cog Room and Art room.
Before the final plug can be entered in Scenario A, the G Young which killed Ben inside the Holding Cell had grown into a G Adult and therefore it must be fought before proceeding toward the sewer entrance. In Scenario B however, William Birkin who armed with a pipe will be face instead. Upon "Dying", William will fall from the passage.
Resident Evil: The Darkside Chronicles
This is the area where William Birkin is fought for the first time in the game, this boss fight follows a few scripts and the player can't kill William early even if the Rocket Launcher or Linear Launcher are used.
Some of William's attacks are tied to QTEs, meaning the player can't interrupt them by shooting him. This area features Sub Machinegun ammo, one Herb and Shotgun ammo. The Sub Machinegun ammo is directly behind the player when the battle starts, the Herb is to the right side when the camera turns towards the other side of the room, and the Shotgun ammo is right next to the door that leads to the Sewer Entrance (North).
|Door to North sewer entrance||It's tightly locked. The panel on the right appears to open it.|
It looks like a panel to release the lock. There are descriptions for the plugs.
"King plug insertion. Rook plug insertion. Bishop plug insertion. Knight plug insertion."
|Door panel (After all plugs has been placed)||All plugs are in place and the lock's been released.|