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Photo: The Canadian Press. All rights reserved.

This undated photo provided by Golfmanna shows golfer Mark Mihal who fell into a sinkhole that opened up under him on the 14th hole of a golf course in Waterloo, Ill. Mihal was hoisted out safely with a rope after falling 18 feet into the 10-foot-wide pit and suffered a dislocated shoulder. (AP Photo/Courtesy Golfmanna)

Mark Mihal was having a good opening day on the links when he noticed an unusual depression on the 14th fairway at Annbriar Golf Club in southern Illinois. Remarking to his friends how awkward it would be to have to hit out of it, he went over for a closer look.

One step onto the pocked section and the 43-year-old mortgage broker plunged into a sinkhole. He landed 18 feet down with a painful thud, and his friends managed to hoist him to safety with a rope after about 20 minutes. But Friday's experience gave Mihal quite a fright, particularly after the recent death of a Florida man whose body hasn't been found since a sinkhole swallowed him and his bedroom.

"I feel lucky just to come out of it with a shoulder injury, falling that far and not knowing what I was going to hit," Mihal, from the St. Louis suburb of Creve Coeur, told The Associated Press before heading off to learn whether he'll need surgery. "It was absolutely crazy."

Annbriar general manager Russ Nobbe described the sinkhole as "an extremely unfortunate event, an event we feel is an act of nature."

"We don't feel there is any way we could have foreseen this happening," he told a Tuesday news conference.

Mihal said it was a real downer on what had been a fine outing.

With winter finally nearing an end, "it was the first day to get to play in a long time," he said. "So I wasn't expecting too much."

Golfing with buddies, Mihal was waiting to hit his third shot, some 100 yards from the pin on the par 5, when he noticed a bathtub-looking indentation about knee deep just behind him on the fairway. At just one over par for the round, the golfer with a 6 handicap was on a roll.

Then the ground gave way beneath him.

"It didn't look unstable," Mihal said. "And then I was gone. I was just freefalling. It felt like forever, but it was just a second or two, and I didn't know what I was going to hit. And all I saw was darkness."

His golfing buddies didn't see him vanish into the earth but noticed he wasn't visible, figuring he had tripped and fallen out of sight down a hill. But one of them heard Mihal's moans and went to investigate.

One of his golf partners, a real-estate agent, made his way into the hole, converted his sweater into a splint for Mihal and tied a rope around his friend, who was pulled to safety.

While disturbing, such sink-holes aren't uncommon in southwestern Illinois, where old underground mines frequently cause the earth to settle. In Mihal's case, the culprit was subsurface limestone that dissolves from acidic rainwater, snowmelt and carbon dioxide, eventually causing the ground to collapse, said Sam Panno, a senior geochemist with the Illinois State Geological Survey.

That region "is riddled with sinkholes," with as many as 15,000 recorded, Panno said.