sewer

tunnel

wastewater

sewage

collector

inside

water

underground

river

reflection

drainage

round

concrete

light

sewerage

leak

draining

flow

channel

waste

stink

pollution

factory

leakage

danger

toxic

environment

dark

tube

urban

interior

concept

deep

dirt

mud

drain

dirty

flooded

outflow

passage

industrial

sludge

subterranean

voronezh

decay

stream

flowing

mystery

corridor