"We love markets that are overlooked, and sewer inspection is one of those markets. And it’s not just because they lie beneath our feet. The US sewer system covers 1.3M miles (over 6B feet), and almost all of us barely give it a second thought. But every foot has to be inspected on a regular basis, usually once every 6 years, at a rate of 400 feet per hour. Inspections are carried out and recorded by camera, and each video currently has to be reviewed more or less in real-time to assess faults and issues. Inspections are vital to maintaining the network."