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.
