Huntington, Utah (AP) A drill tunneling into a mine might have actually gone into a sealed chamber rather than the area were six miners are believed to be trapped.
A microphone dropped into the hole produced no sounds and widely differing air samples.
Initially, air samples showed oxygen levels of 20 percent, which would support life. But later samples showed oxygen levels of 7 percent, which are similar to the readings taken earlier in the search from a previously sealed chamber.
Officials cut their morning news conference short saying they had a lot of work to do. It's been four days since the collapse of the mine left six men unaccounted for in the Crandall Canyon Mine near Huntington, Utah.