Huntington, Utah ? A camera lowered into a collapsed coal mine revealed equipment but not the six missing miners Sunday, and officials planned to drill yet another hole in a desperate hope of finding signs of life nearly a week after a thunderous cave-in.

Poor lighting allowed the camera to only see about 15 feet into a the space where they hoped to find the men. The video showed only a tool bag, a chain and other equipment, said Richard Stickler, head of the Mine Safety and Health Administration.

“We did not see any sign at all of any of the miners,” Stickler said.

He said officials would try again with an improved lighting system, which should allow the camera to see 100 feet. It wasn’t clear when the attempt would be made.

The view of the equipment was recorded overnight on the camera’s second attempt to find signs of the miners. On its first descent Saturday, during which one lens was impaired, the camera showed a 5 1/2-foot-high void described by Stickler as “survivable space.”

The men have not been heard from since the mine was struck by an earthshaking collapse early last Monday. Rescue leaders said they were proceeding as if the miners were alive.

“Our attitude is we always have to have hope, and our position is that we’re hoping and we’re praying and it would be a terrible mistake to give up hope until you know for sure,” Stickler said.

The drill rig was to be relocated to a new position late Sunday to create a new hole 1,414 feet deep. The previous holes were more than 1,800 feet.

Bob Murray, head of Murray Energy Corp., co-owner of the mine, said the new hole will target an area that the miners would have gone if air in their original location was bad.

Stickler would not estimate how long it would take to drill the new hole. Murray initially estimated three to four days, but his vice president, Rob Moore, said quietly to him during a news conference that it could be up to six days.

The Crandall Canyon mine is built into a mountain in the Manti-La Sal National Forest 140 miles south of Salt Lake City.

Opening off a narrow canyon, the mine’s main entrance is large enough for vehicles to enter and drive deep into the mine. At the time of the collapse, the miners were believed to be working at a point 3.4 miles from the entrance.

Rescuers have also been slowly moving horizontally through the mine to try to reach the men.

The horizontal route was blocked about 2,000 feet from the men. Rubble had been cleared from about 580 feet of that route, Stickler said Sunday. The distance had been estimated at 650 feet late Saturday. The discrepancy was not immediately explained.

Crews working that route had to be withdrawn for a time overnight because of earth movements known as “mountain bumps,” officials said.