A dark underground sewer tunnel with wastewater flowing inside a round concrete pipe.
Keywords
sewer,
tunnel,
sewage,
concrete,
underground,
dark,
urban,
industrial,
water,
pipe,
drainage,
environment,
shadow,
flow,
plumbing,
engineering,
system,
city,
design,
infrastructure,
maintenance,
transport,
liquid,
waste,
effluent,
collection,
surface,
service,
network,
construction,
light,
depth,
circular,
trapped,
utility,
disposal,
sanitation,
pollutant,
treatment,
safety,
access,
city landscape,
pollution,
flowing