underground wire; underground cable
Refers to electrical wires or cables laid underground, often in the context of power distribution or telecommunications.
この地域では地下線が使われている。
Underground cables are used in this area.
地下
Construction work to lay underground cables has begun.
架空線 refers to overhead wires, contrasting with underground cables.
Compound of 地下 (underground) and 線 (wire, line).