Norway, MI (CNN) - Take a look at this video of a rafting trip gone wrong on Michigan's Upper Peninsula.
A group of rafters were crossing Piers Gorge when the forceful waters took control of the boat.
Onlooker Jason Asselin, captured this video for CNN's iReport.
He says the voyage turned frightening as the rafters paddled back upstream against the current.
Apparently, the boaters were in a spot where the river was flowing over a rock.
Jason says two people fell out of the raft, but didn't appear hurt.
The instructor eventually got the boat and the situation under control.