The cesspool tank is an area of the sewage disposal plant feature in Resident Evil 2.
The lever to fill the water can be found in front. There's a shelf located across, while below contains three heavy boxes.
This area can only be ventured by Sherry or Ada. Before filling the passage below with water, the three boxes below must be rearrange to enable characters to across and reach the shelf, therefore obtaining the Club Key.
|Lever up front||A lever to fill and drain water. Will you move it? Yes/No|
|Map||There's a sewage disposal map. Will you take it? Yes/No|