Controlled environments are safe, right?

Accidents reported range from minor trauma to electrocution with associated heart arrhythmias, gas and fluid poisoning, hypo- and hyperthermia, and exceeding permissible occupational standards (e.g., CO2 inhalation in poorly ventilated spacesuit simulators). There have been life-threatening events both because of poor safety measures and little to no protocols in place for, for instance, evacuating an injured crew member.