Here is a short video of the Panorama SI Manhole Scanner scanning a 60 foot Wet Well in the Ottawa area. This unit isn't optimized for such a wide underground structure, but still has a pretty impressive 360 degree viewing angle. Just think of the safety concerns, equipment setup, specialized training, people and amount of time it would take to investigate this type of underground structure. The Panorama SI does it in under 4 minutes! We accessed the files with the free viewer included with the machine.
You can read more about the Panorama SI Digital Manhole scanner on its Equipment page!