Police card A composite image showing the pit and Elizabeth Pollard.

Police  card A composite image showing the  pit and Elizabeth Pollard.  Ms Pollard  smiles at the camera, has long blonde  hair and  wears a black  blouse with white  patterns. The hole is lit by a  flashlight and is surrounded by grass at the  opening. Police document
Police believe Elizabeth Pollard fell into  a large hole while searching for her  cat
Authorities in Pennsylvania are searching underground for a woman who  allegedly fell into a  30-foot-deep pit that may have opened  beneath her feet  while searching for her  missing cat.Not a valid attachment ID.
Elizabeth Pollard, 64, was reported missing by family members after she went  looking for the cat on Monday  night.
The authorities who arrived  for the first  time on the scene  almost fell into the same hole, which they  believe is connected to an abandoned coal  mine. Microphones and cameras  were lowered into the hole, but  Ms. Pollard has  not yet  been found.  Authorities say their cameras  picked up what appeared to be a  shoe.
Ms. Pollard's car was found parked behind a restaurant in the town of Marguerite, 40 miles east of Pittsburgh,  on Tuesday  morning.
Her five-year-old granddaughter was  in the car,  authorities said, adding that the girl was cold but not  injured.
Pennsylvania State Police  Officer Stephen Limani told reporters that the hole  was the size of a  municipal building. What are  the sinkholes and what  are their causes?
CBS An aerial view shows  rescue workers working around the  sinkhole, which is  located next to a  single-story building. A tractor, crane and fire  extinguisher are also  nearby. CBS
Rescuers widened the original hole and opened a second one  in an attempt to access the  victim
"It was about the size of  a manhole  cover, but the pocket underneath is significantly larger, and  in trying to send cameras down there, we determined  it would take about  30 feet before  we could see  much debris," Mr. Port said.
Authorities believe the sinkhole opened  while Ms. Pollard was  inside looking for her  cat, Pepper. They hope she  will be rescued in an underground  "vacuum." "It appears that the  hole may have formed while Mrs. Pollard was  walking," said Mr. The port.
"We see  no record of  a time  when this hole  could have been there  before Mrs. Pollard decided to walk and look for her  cat."
More than 100 people  took part in rescue  operations on Wednesday, he added.  State government mining experts are also  at the  site and  authorities have dug an additional  pit to access the site, which they fear is  unstable.Not a valid attachment ID.
Temperatures, which have  dropped below freezing  in recent days, are much warmer  in the hole than  on the surface. Authorities have not  yet detected any dangerous  gas that  is sometimes found in abandoned  mines. John Bacha, chief of the Pleasant Valley Volunteer Fire  Company, told reporters that the shoe found does not appear to  be from when the mine was still  in operation.
"It's a modern  shoe, not something  you would find in a coal mine in Marguerite in  the 1940s," he said, according to NBC News.

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