 If you want to do construction, especially in a major city, it is very challenging. What is underground in most major cities is the lifeblood of the cities. The water, sewers, electric, gas. They're buried underground, largely forgotten. Their location and condition is largely unknown. Quite often there's construction where pipes are accidentally cut, even though these precautions are taking. Then it becomes very expensive to cut off somebody's electricity, break a steam pipe, gas pipe. We think we have a way to address that. The rig is a modified ground penetrating radar that detects underground features with electromagnetic waves. This system, as presently configured, can read 6 to 12 feet. 12 feet if they're favorable soil conditions, a little bit less if it's unfavorable conditions. The radar uses high-frequency electromagnetic waves, launches them into the ground. They come back and produce traces, wiggles, that are complicated and very hard to interpret. We then use information from a photogrammetry system embedded in a smartphone that looks at fixed landmarks, signs, fire hydrants. They locate where you are relative to the earth. It takes the photogrammetry, the radar information, and prior information from the site. It integrates all three of those together to create an underground map of the pipes. You put on goggles and the augmented reality takes the 3D map and you can see the city streets where you're at. There are two pipes here that go across each other and basically with the HoloLens I'm able to walk around, look at the pipes from different perspectives, different directions. In the future we want also to connect this data with a database where the user can interact with these three objects and know what the pipe is made of, what is running through it. The technology is very important because of worldwide population trends. Everybody seems to be moving to the big cities. So the cities are now becoming more important and the underground infrastructure is becoming more important as the cities grow. We have to manage that. It's a more important problem than ever.