The industrial accident took place at the Ontario Tank Wash on Eastport Boulevard at around 5:30 p.m.
Emergency crews arrived on scene to rescue the two male victims.
Paramedics said a man believed to be in his 30s was taken to hospital without vital signs and a 23-year-old man was taken to hospital with life-threatening injuries after the incident.
The ministry of labour has been notified.
Source: CP24