Using underground communication facilities can be beneficial in areas where a neighborhood or city is too dense to install other methods. They offer lower transmission losses, and emit a lower magnetic field than an overhead line. They are also less prone to be affected by severe weather.
Placing fiber optic cables below ground will protect them from harsh environments. It also can give a later opportunity for future expansion, without the need to dig any more than was already done. This can be very beneficial in urban areas.
The cables, lines, and pipes needed to power all of a community's collective utilities can take up a lot of space. And as a town grows, having power lines and other utilities above ground can be hazardous. Using underground utilities cuts back on the danger and the space they may have taken above ground, leaving your community cleaner and safer.