The firefighter is out of the tank after having attached a harness to the victim. Larry Shapiro photo

The firefighter that was inside the tank heads toward the decontamination unit as others in protective gear standby to help retrieve the victim. Larry Shapiro photo

The firefighter begins the decontamination process. Larry Shapiro photo

Using the ropes and pulleys, firefighters work to extract the victim from the bottom of the tank. Larry Shapiro photo

Another view of the overall scene with technical rescue, support, and EMS personnel in place. Larry Shapiro photo

The decon unit has separate areas to decontaminate the victim and the rescue personnel. Larry Shapiro photo

Another firefighter begins the decontamination process. Larry Shapiro photo

The firefighters begin their decontamination outside the unit before going through a series of showers inside the truck. Another team works to decontaminate the victim on the other side. Larry Shapiro photo

All contaminated ropes and equipment are collected. Larry Shapiro photo

After completing the decontamination showers, a firefighter dons a generic smock before going to the hospital for a quick examination. Larry Shapiro photo

The external decontamination area alongside Decon 1. Larry Shapiro photo

Additional ambulances from Elk Grove Township and Skokie were special called to the scene to standby for medical emergencies. Ambulances from Wheeling, Buffalo Grove, Northbrook, and Highland Park were used for firefighters, the victim, and another worker from the cleaning company. Larry Shapiro photo

Des Plaines Fire Department Technical Rescue Squad. Larry Shapiro photo