A 40-year-old man was airlifted to an out-of-town hospital following a workplace accident in Kitchener.
It happened in the Balzer Road area on Monday around 2 p.m.
While details on what happened are currently unavailable, Waterloo Regional Police confirmed the man's injuries are considered life-threatening.
An Ornge helicopter was called in to transport him, and he remains in critical condition.
The Ministry of Labour is investigating the incident.