Underground has a bunch of other issues as well, in the UK all records of the underground ducting have been lost in many areas in the 50-70 years since it was i

Underground has a bunch of other issues as well, in the UK all records of the underground ducting have been lost in many areas in the 50-70 years since it was installed, which makes it a big headache. Which makes fixing, replacing etc quite expensive and the quality can be suspect.