June 18, 2013 (PORTER, Ind.) (WLS) — Several beaches in northwest Indiana remain closed for swimming Tuesday after a substance was found in the water.

Investigators are trying to identify the substance that showed up in the water Monday.

Chopper 7 HD was overhead as a dark, slimy substance snaked its way through the southern tip of Lake Michigan- but on Monday, experts said the substances seen streaming into the lake are considered normal from erosion and storms.

“There was a silvery, sticky material that was literally sticking to kids as they came out of the water. So they called 911, and national rangers responded and at that point they closed the water,” said Bruce Rowe, a park ranger with the National Park Service.

Officials then ordered swimmers at Porter Beach and the Indiana Dunes State Park out of the water. The unknown substance has closed other beaches from Porter to Michigan City, as well.

Rowe is anxiously awaiting rest results Tuesday morning as he informs people at the Visitors Center about the problem.

“We stoppeda the Visitors Center trying to find beach spots and they told us we’re not allowed in the water,” said Syahirah Aziz, a disappointed visitor.

“Something’s in the water and it shouldn’t be there,” said Carl Dahlin, a Porter, Indiana resident.

Dahlin says he’s never seen anything like it here at the Indiana Dunes. He says he saw several people emerge from the water coated in the stuff.

“They were worried when they saw two kids come out of the water and the one was, his head and half his body was covered a bit in black. It became worrisome at that point,” said Dahlin.

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Mysterious substance closes Lake Michigan beaches in northwest Indiana | Officials await test results