At Elias, a completed Chevron operation, the only sound to disturb the replanted clover meadow is a faint whooshing as gas passes to an underground pipe network.

ECONOMIST: Fracking

About 1, 200 shacks had been built on the land, which is crossed by a shallow underground fuel pipe, a power pylon and a railway line.

BBC: Police evict SA squatters

Neighbor Michael Creel said Dykes put the plastic pipe underground from the bunker to the end of his driveway so he could hear if anyone drove up to his gate.

NPR: Ala. Town Mourns For Bus Driver Amid Standoff

Authorities have been conferring in a nearby church and communicating with Dykes through a ventilation pipe to the underground bunker.

NPR: Ala. Town Mourns For Bus Driver Amid Standoff

It works like this: Trane bored holes up to 500 feet underground and installed dozens of loops of pipe.

FORBES: Fort Knox's Buried Treasure

The suspect, who police have identified as Dykes, is holed up in a bunker 4 feet underground and built at least partially out of PVC pipe, authorities have said.

CNN: STORY HIGHLIGHTS

They are thought to have been caused by a collapsed Victorian clay sewer pipe found 1.5m (5ft) underground.

BBC: Medieval bones found underneath Reading's Friar Street

The current phase of production at the Ekati Diamond Mine includes ore sourced primarily from the lower grade, but high carat value, Fox open pit supplemented by underground production from the lower portion of the Koala kimberlite pipe and from the Koala North pipe.

FORBES: Harry Winston to Purchase Ekati Diamond Mine For $500 Million

Late in the evening, the man had the child in some sort of underground bunker or storm shelter, and SWAT team members were communicating with him through a PVC pipe, CNN affiliate WSFA reported.

CNN: STORY HIGHLIGHTS