Officials with ISP would not confirm which investigation Tuesday's search pertained to.
"We're just looking for evidence that may or may not be there," ISP Public Information Officer Joe Watts told The Brazil Times. "We're looking at the pond as a potential site where evidence may be."
While Clay County Prosecutor Lee Reberger confirmed Tuesday's event, he said it could not be "attached to any investigation at this time."
Divers from several ISP Districts -- including Sellersburg, Connersville, Evansville, Pendleton, Putnamville, Indianapolis, Terre Haute, Jasper and Bloomington -- took part in Tuesday's search.
"We brought in divers from the southwestern part of Indiana," ISP Sgt. Chris Wright said. "We're going to hit the obvious areas and start with the west side, approximately 75 feet out into the water.
"We've got 15 divers and some support personnel helping with equipment," Wright continued. "We do that often, especially with a large body of water."
Several of the divers hit the water at close to 10 a.m. Tuesday.
"We've got several scuba divers here because it's such a large body of water," ISP Det. Sam Stearley said. "We're looking for potential evidence on a crime that was committed and it may be here in the pond."
ISP officials also had metal detectors with them Tuesday, using them on the edge of the pond.
ISP Sr. Trooper Matt Ames was one of the divers involved Tuesday. He said it was difficult to see while underwater.
"It's very silty," Ames said. "When you move the silt, the visibility goes down to zero. When you hit the bottom, you're using touch."
Watts said the search continued throughout the day.
"We're searching what is accessible," Watts said. "We're concentrating on areas that are easily accessible, by foot or vehicle. Do we think something may be there? We have no concrete evidence."