I was always curious what happens when the line clogs (as they always do) and the city has to jet (for an example http://www.vactor.com) the line or even better use a root cutter to get the grease and roots out of the line. Some of the nozzles on these things can tear anthing apart including the sewer itself.
Sending robots to do the dirty work in sewers has been done for quite some time (example: http://www.rstechserv.com )
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I was always curious what happens when the line clogs (as they always do) and the city has to jet (for an example http://www.vactor.com) the line or even better use a root cutter to get the grease and roots out of the line. Some of the nozzles on these things can tear anthing apart including the sewer itself. Sending robots to do the dirty work in sewers has been done for quite some time (example: http://www.rstechserv.com )