underground sewage tunnel with dim lighting

sewage tunnel underground dim lighting wastewater pipes drainage dark infrastructure system industrial flow plumbing concrete sewer engineering undergroundtunnel pollution treatment sanitation water environment urban facility pipeline construction waste liquid outflow undergroundsewer drainagesystem pipenetwork wastemanagement urbanization filtration sewagesystem tunnellighting sewerage darkness hydraulics flowsystem maintenance pollutioncontrol infrastructuretunnel undergroundpipes dimlight environmental piping ai generated