Police in Bloomingdale are combing through the Sycamore Ridge Landfill near Pimento, Ind. in search of any evidence that can help with the disappearance of Lauren Spierer.
The search is expected to take about two weeks, police say.
Agents with the FBI, the Indiana University Police Department and a missing and exploited children's expert are currently working the landfill site, according to Reuters.
Spierer, a 20-year-old Indiana University student, went missing on June 3 after partying with friends.
The friends haven't said anything about what happened that night and the "deafening silence" is compounding the family's frustration, her parents say.
"There is no reason to think the people Lauren was last with, wouldn't do everything in their power to help us find her," Rob and Charlene Spierer wrote on the Web site findlauren.com. It is a Web site dedicated to finding their daughter.
The Spierers said the friends' silence "threatens to be our undoing."
But the parents said they will continue to search for their daughter.
"We will never give up," the Spierers wrote.