Michigan City, Ind. The investigation continues into what caused the hole on Mt. Baldy that trapped a young boy just over a month ago.
On Monday, crews from the National Park Service and EPA discovered a 10-inch wide and five-foot deep hole while surveying dunes.
A representative for the park service told NewsCenter 16 that a drill-like piece of equipment known as an auger was brought in on Wednesday to investigate it further.
Rangers say the auger took airtight samples from the hole, which will be sent out for testing.
The results of those tests could take weeks to come back.