On Tuesday night a man was heard yelling for help at about 10:30 p.m.
Emergency crews found the man in the water clinging to the shoreline.
He was rescued but told emergency crews his friend was still in the water.
A large scale search was launched for the second man.
Officers from the Toronto police marine unit launched an inflatable dingy and also waded through the water looking for the other man. .
So far he has not been found.