Day 1: Monday, Aug. 6

• A seismic event registering 3.9 on the Richter scale is recorded by the University of Utah Seismograph Stations in the area of the Crandall Canyon Mine at 2:48 a.m.

• About an hour later, an Emery County sheriff's deputy receives a call about a mine collapse.

• Rescuers attempt four separate ways to access six miners believed to be trapped 1,800 feet underground.

Day 2: Tuesday, Aug. 7

• Another seismic "bump" collapses part of the tunnel, shutting down underground rescue work. "We are back to square one underground," mine owner Bob Murray says.

• During a news conference, Murray offers updates but also attacks unions and some news media outlets.

• Atop the mountain, workers clear a road and begin drilling a 2-inch-diameter 1,800-foot vertical shaft.

Day 3: Wednesday, Aug. 8

• Drilling efforts on the mountain above the mine make progress, cutting more than halfway to the chamber.

• The names of the trapped miners are learned. "They'll walk out of there," one family member says.

• Utahns pray at vigils and celebrate Mass for the miners and their families.

Day 4: Thursday, Aug. 9

• Descending 1,868 feet, the drill boring a 2-inch hole breaks through into a chamber at 9:47 p.m. A microphone picks up no human noise. Oxygen-level samples from the mine vary.

• A high-resolution camera is flown in as another drill grinds steadily toward the collapsed area.

• Communities in Utah's coal country rally behind families of trapped miners.

Day 5: Friday, Aug. 10

• As work continues in the mine tunnels, federal mine officials say the drill may have missed the chamber where the trapped miners are.

• The families of three of the trapped miners ask people to "light a candle and raise a prayer for our miners."

Day 6: Saturday, Aug. 11

• A second, larger drill punches an 8 5/8-inch hole into the mine about 3 a.m. After quieting their machines, rescuers tap on the drill steel but hear no response.