The hazard
Everyone brings their life to work: money worries, family problems, long hours, time away from home, grief or a layoff. Stress, burnout, anxiety, depression and substance use are health problems, not weakness, and people do get better with help. They also pull your focus off the task, and on a jobsite a lost focus can get someone hurt. Looking out for each other's minds is part of looking out for each other's safety.
The action
Watch for changes in a coworker: pulling away from the crew, being unusually quiet or angry, more mistakes or near misses, coming in late or missing days, or drinking or using more. Talk about feeling hopeless, trapped or like a burden is a serious warning sign. You do not need to diagnose anything. You just need to notice and care enough to ask.
ASK THE CREW
What changes in a coworker would make you stop and ask if they are okay?
From the talk: Mental health at work. Read it in full, free, with the questions and the sign-in sheet.