This is a sewer robot. It has a headlight and a video camera. It is lowered into the sewer and it crawls up your sewer pipes with its rubber tracks. It records what it sees so that others may judge.
This is a sewer-robot-man at work. He takes the robot’s video and shows it to his masters, who watch it alone in the dark.
Those things at the bottom are just leaves, don’t freak out.
Notice the steel cable, it leads into one of those small inlets – that’s where the robot is. I hope he finds what he is looking for.