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Singapore pours $7.2bn into underground sewer superhighway

City-state aims to reduce dependence on neighboring Malaysia

Desalination plants, such as this one in Singapore's western Tuas district, are part of the city-state's effort to raise its self-sufficiency in water.(Photo by Mayuko Tani)

SINGAPORE -- The government of Singapore is spending $10 billion Singapore dollars ($7.2 billion) to complete an underground sewer system in the city-state.

The pipeline, dubbed the "underground superhighway," is 3- 6 meters in diameter and buried 35- 55 meters underground. It will collect wastewater from households and factories and transport it to treatment plants, which will be used mainly for industrial and air-con cooling purposes.

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