https://medium.com/@ABPipelines/what-can-a-cctv-inspection-do-for-your-pipework-17f3ba6814d4#.fkmgxydpm

A closed circuit television inspection CCTV is now an established and non-destructive way of checking out the condition of the pipework underground that you may be responsible for or you may be thinking of becoming responsible for It is not limited to being used in an emergency and is a great preventative tool An inspection using CCTV cameras will provide far more detailed evidence than could be traditionally provided especially in hard to reach areas and it will give peace of mind or pre
https://medium.com/@ABPipelines/what-can-a-cctv-inspection-do-for-your-pipework-17f3ba6814d4#.fkmgxydpm