dimly lit, arched pedestrian tunnel in Saint Petersburg, Russia

dimly lit, arched pedestrian tunnel in Saint Petersburg, Russia. The walls of the tunnel are painted a pale yellow, with a darker, brick-like material near the ground. The ceiling is also yellow and shows signs of age and wear. The floor is paved with dark gray interlocking bricks. A large, irregularly shaped stain of a reddish-pink color runs down the center of the tunnel floor, appearing to be paint or liquid. The tunnel opens into a brighter area, visible through an arched gateway at the far end. Through the gate, there are buildings with windows, red benches, and planters with flowers. A metal fence with decorative scrollwork is visible in the opening. Cables and conduits run along the upper right wall of the tunnel. A small, green leaf is lying on the paving stones in the middle of the tunnel. There are no people visible in the image.