Mount Baldy closed indefinitely, under investigation

July 17, 2013 9:21:37 AM PDT
Mount Baldy in the Indiana dunes will remain closed indefinitely as investigators try to figure out what caused a mysterious cavern in the sand that swallowed a six-year-old boy last Friday.

Nathan Woessner was buried for three hours and remains in critical condition Tuesday night.

One theory is that the sand condition was caused by a decomposed tree.

Park officials believe the rest of the dunes are safe.