21.   Across the street is a sewer system where dozens of homeless children often escape the cold by sleeping alongside huge underground pipes of warm water at night.

22.   Gas accidents have become more frequent in recent years, as more and more homes receive gas through underground pipes.

23.   Government officials have alleged Israel is pumping water from the Wazzani through underground pipes.

24.   In August, vandals cut cords and cables, destroyed circuit breakers, damaged electrical conduits and stuffed nuts and bolts into underground pipes.

25.   It swooshes through underground pipes to sewage treatment plants to be treated.

26.   Its high-tech plant is largely fueled by methane gas captured in underground pipes from garbage fumes at the Chattanooga landfill.

27.   Jail warden Warlito Mosende said inspectors found leaks in an underground pipe supplying water to the jail.

28.   Leaks in the underground pipes are common and often go unrepaired, melting long trails through winter snow drifts in city parks and beside roads.

29.   Meanwhile, Prolintas general manager Abdullah Hasan said the incident happened when an old asbestos underground pipe burst during work to deviate the sewerage pipe.

30.   Other smaller explosions resulting from gas accidents have become more frequent in recent years, as more and more homes receive gas through underground pipes.