Riley County authorities say a man has been hospitalized after wrecking his airboat in Tuttle Creek Lake.

Emergency Management Director Pat Collins said Sunday it took first responders more than two hours to rescue the man from a portion of the lakeshore without drivable access on Saturday night. He says the man was suffering from hypothermia when he was hospitalized. Collins didn’t provide an update on the man’s condition Sunday.

Collins says a passerby heard the man yelling and swam across the lake to find him before calling 911.

It’s unclear what caused the wreck.