Coolant System Sewer Basin The murky, stagnant swamps above drain down through countless ducts, pipes, and drains, eventually reaching this large basin. This huge, cylindrical chamber is nearly entirely full of dark, oily water, with more constantly flowing down from above from the myriad assortment of grates and sewers. Hoses and pipes criss-cross the open expanse, many broken and leaking, others providing a solid enough surface to stand upon. Spotlights rim the top of this chamber, but due to disrepair and the constant flow of fluid from the surface, few remain functional, and those that do sputter and flicker, providing only meager illumination.