Water supply network is an important component of water supply systems. Purified water goes through the intricate network of underground pipes to users.

给水管网是给水系统的重要组成部分，净化后的水经过错综复杂的地下管网，达到用户终端。

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Many goods are smuggled from Egypt through a network of underground tunnels into Gaza.

BBC: Gaza construction convoy crosses from Egypt

Uniform grooves across its craters and ridges hint at a global network of underground layers, which Cheng says could indicate Eros was once part of a larger body.

BBC: Eros is 'no ordinary rock'

Meanwhile, Paul Benney, a resident artist at Somerset House, has chosen its Deadhouse, a network of underground passages beneath the fountain court, to display his latest series of "Night Paintings" (until Dec. 9).

WSJ: London Artists and Curators Ponder the Unconventional With Unique Spaces