Empty stairs in underground tunnel

abstract aisle architecture atmosphere blank buildings building cities city contemporary corridors corridor dark deserted dreary emptying empty entrance gloomy local traffic local transport metros metro metro modern mood municipal nobody no one no people passage passenger traffic pedestrian subway public transportation public transport short range public transportation short range transit staircase stairs stairways stairway stair stations station steps step structure subways subway subway town tunnels tunnel u bahn underbridges underbridge underground tunnel underground underpasses underpass uninhabited urban environment urban walkway