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SEFFNER, Fla. (AP) -- Engineers worked gingerly to find out more about a slowly growing sinkhole that swallowed a Florida man in his bedroom, believing the entire house could eventually succumb to the unstable ground.

Jeff Bush, 37, was in his bedroom Thursday night when the earth opened and took him and everything else in his room. Five other people were in the house but managed to escape unharmed. Bush's brother jumped into the hole to try to help, but he had to be rescued himself by a sheriff's deputy.

Engineers were expected at the home to do more tests after sunrise Saturday. They spent the previous day on the property, taking soil samples and running various tests - while acknowledging that the entire lot was dangerous. No one was allowed in the home.

"I cannot tell you why it has not collapsed yet," Bill Bracken, the owner of an engineering company called to assess the sinkhole, said of the home. He described the earth below as a "very large, very fluid mass."

"This is not your typical sinkhole," said Hillsborough County administrator Mike Merrill. "This is a chasm. For that reason, we're being very deliberate."

Officials delicately addressed another sad reality: Bush was likely dead and the family wanted his body. Merrill, though, said they didn't want to jeopardize any more lives.

"They would like us to go in quickly and locate Mr. Bush," Merrill said.

Two adjacent houses were evacuated and officials were considering further evacuations. Even the media was moved from a lawn across the street to a safer area a few hundred feet away.

"This is a very complex situation," said Hillsborough County Fire Chief Ron Rogers. "It's continuing to evolve and the ground is continuing to collapse."

Sinkholes are so common in Florida that state law requires home insurers to provide coverage against the danger. While some cars, homes and other buildings have been devoured, it's extremely rare for them to swallow a person.

Florida is highly prone to sinkholes because there are caverns below ground of limestone, a porous rock that easily dissolves in water.

"You can almost envision a piece of Swiss cheese," Taylor Yarkosky, a sinkhole expert from Brooksville, Fla., said while gesturing to the ground and the sky blue home where the earth opened in Seffner. "Any house in Florida could be in that same situation."

A sinkhole near Orlando grew to 400 feet across in 1981 and devoured five sports cars, most of two businesses, a three-bedroom house and the deep end of an Olympic-size swimming pool.

More than 500 sinkholes have been reported in Hillsborough County alone since the government started keeping track in 1954, according to the state's environmental agency.

The sinkhole, estimated at 20 feet across and 20 feet deep, caused the home's concrete floor to cave in around 11 p.m. Thursday as everyone in the Tampa-area house was turning in for the night. It gave way with a loud crash that sounded like a car hitting the house and brought Bush's brother running.

Jeremy Bush said he jumped into the hole but couldn't see his brother and had to be rescued himself by a sheriff's deputy who reached out and pulled him to safety as the ground crumbled around him.

"The floor was still giving in and the dirt was still going down, but I didn't care. I wanted to save my brother," Jeremy Bush said through tears Friday in a neighbor's yard. "But I just couldn't do nothing."

He added: "I could swear I heard him hollering my name to help him."

A dresser and the TV set had vanished down the hole, along with most of Bush's bed.

A sheriff's deputy who was the first to respond to a frantic 911 call said when he arrived, he saw Jeremy Bush.

Deputy Douglas Duvall said he reached down as if he was "sticking his hand into the floor" to help Jeremy Bush. Duvall said he didn't see anyone else in the hole.

As he pulled Bush out, "everything was sinking," Duvall said.

Engineers said they may have to demolish the small house, even though from the outside there appeared to be nothing wrong with the four-bedroom, concrete-wall structure, built in 1974.

Jeremy Bush said someone came out to the home a couple of months ago to check for sinkholes and other things, apparently for insurance purposes.

"He said there was nothing wrong with the house. Nothing. And a couple of months later, my brother dies. In a sinkhole," Bush said.

TROY, Mo. (AP) -- A bank robber who was caught at gunpoint by the president of the eastern Missouri bank has been sentenced to six years in prison.

The St. Louis Post-Dispatch reports that the sentence was handed down Friday for 58-year-old Donald Ray Lee. He pleaded guilty last month to second-degree robbery.

Lee was wearing a Halloween mask when he robbed the People's Bank & Trust in Troy on Oct. 30. He demanded money from the teller and put his hand in his coat pocket, indicating he had a gun.

He didn't really have a weapon, but bank president David Thompson did.

Thompson grabbed his Colt .380 handgun and followed Lee o the parking lot. He held Lee at gunpoint until police arrived.

Lee had $4,779 of the bank's money.

ROLLA, Mo. (AP) -- The Missouri University of Science and Technology is planning a "Jeopardy!" watch party for a faculty member who landed a spot on the game show.

Ilene Morgan will make her debut on Tuesday's episode of the show. The university says the watch party is planned for 4:30 p.m. that day in the Gale Bullman Multi-Purpose Building on the Rolla campus.

Morgan is an associate professor of mathematics and statistics. She tried twice to land a spot on the program before succeeding last year. She traveled to Culver City, Calif., to compete on Oct. 29 and 30.

Morgan described her "Jeopardy!" experience as "bucket-list awesome." She said she was having fun and wasn't thinking about the audience, the camera or the prize money.