This is the first part of a major crossover with "Chicago Fire," "Chicago Med," and "Chicago P.D.": Chicago Fire – S13E11 – In the Trenches (1) Chicago Med – S10E11 – In the Trenches (2) Chicago P.D. – S12E11 – In the Trenches (3) ************************************* Chicago's first responders unite in the wake of a catastrophic gas explosion and fire that threaten a city government building. Herrmann reluctantly shadows Pascal while Violet, Novak and Dr. Frost take charge of triage efforts on site.