Under the watchful eye of Yuma Fire Department Capt. Paul Evancho, right, Yuma Fire Department 21-1 Fire Recruit Academy cadet Caleb Newgent, left, uses a pike pole to scribe a hole for fellow Mike Erickson to use as a guide while using a gas chainsaw to cut a hole in the "roof" of a prop at the Public Safety Training Facility, during a "vertical ventilation" exercise, Wednesday, March 3, 2021, in Yuma, Ariz. (Randy Hoeft/The Yuma Sun via AP)