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Using a steel drill bit to bore a 2 1/2-inch wide hole more than 1,800 feet into the mountain site of Monday's cave-in, rescuers finally broke through late Thursday into the cavity where authorities believe the miners are trapped. A crude measurement found enough oxygen to keep the men going if they survived the collapse.
Though the air sample indicated plenty of oxygen and no methane in the pocket, it also did not pick up carbon dioxide, the gas exhaled when people breathe.
Despite the silence, company officials remained hopeful.
"I wouldn't look at it as good or bad news. The work is not done," said Bob Murray, chairman of Murray Energy Corp., who added early Friday that oxygen levels suggested that if the men survived the collapse, "they're going to stay alive in that atmosphere."
The air sample was sucked from the cavity through a steel tube, with a microphone attached to pick up any signs of life.
Relatives shouldn't be discouraged by the lack of carbon dioxide, a lawyer for the company said.
"What you got was a quick sample from a crude instrument, so you don't get all the constituents reported," said attorney Christopher Van Bever.
The drill bit finally broke through at 9:47 p.m. MDT on Thursday, more than two days after drilling began. Two hours later, Murray and officials from the Mine Safety and Health Administration said there was no immediate response after the drill reached the pocket.
Meanwhile, drilling continued on a second, wider hole, which could accommodate a powerful camera to provide a view inside the pocket, deliver food and water, and hopefully give a more definitive answer about the miners' fate.
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 Work also continued in the mine itself, where rescuers were slowly burrowing through the debris to reach the workers.
"It's incredibly labor-intensive," said Rob Moore, vice president of Murray Energy.
If the miners are alive, they might be sitting in inky darkness, their headlamps likely having burned out. Wearing thin work clothes in the 58-degree cold, they could be chilled to the bone if water is seeping into their chamber 150 stories below ground, other miners say. Murray said each miner would typically have had a half-gallon of water.
At the time of the collapse, the six miners were working in an area with an 8-foot ceiling. Corridors in the mine are typically about 14 feet wide.
The mining company has withheld the names of the six miners. The Associated Press has confirmed five identities: Carlos Payan, Don Erickson, Kerry Allred, Manuel Sanchez and Brandon Phillips.
The men's families were praying for their survival, one relative said.
"There are all types of conditions that could be in there for these folks ... some little cavity, some little corner," said Arch Allred, cousin of miner Kerry Allred.
[Associated Press; by Garance
Burke]
Associated Press writers Pauline Arrillaga, Jennifer Dobner and Brock Vergakis in Huntington contributed to this report.
Copyright 2007 The Associated Press. All rights reserved. This
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