In this cell phone image taken March 8, 2013, Hank Martinez, top, Ed Magaletta, right, and Russ Nobbe, look into an 18-foot-deep sinkhole that golfer Mark Minhal fell into at Annbriar Golf Course in Waterloo, Ill. (Courtesy of golfmanna.com, Mike Peters)

In this cell phone image taken March 8, 2013, Hank Martinez, top, Ed Magaletta, right, and Russ Nobbe, look into an 18-foot-deep sinkhole that golfer Mark Minhal fell into at Annbriar Golf Course in Waterloo, Ill. (Courtesy of golfmanna.com, Mike Peters)