Δες κι αυτό τον ορισμό από επίσημο έγγραφο (Mississippi):
"
Underground utility lines" shall mean underground or buried cable, conduit pipes and related facilities for transportation and delivery of electricity, telecommunications (including fiber optics), water, sewage, gas, mixtures of gases, petroleum, petroleum products or hazardous, flammable, toxic or corrosive liquids.
Αν 40.000 "underground utility lines" όλα σημαίνουν το ίδιο...
Και
εδώ "dense network of underground utility lines".