Something as simple as leftover concrete from a primary job being used to make the pipes or concrete with to much water added or over the time limit can turn the strength of the concrete used to the strength of topsoil. I'm not stating that this happened but if the pipes are failing this is a possible area to look at. There probably is very little quality control to be certain that things are on the up and up.
Check out the Big Dig on Google. Very interesting for sure.
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