You should get out of a manhole as soon as you start feeling

• A. Thirsty
• B. Like sneezing
• C. Sick to your stomach
• D. Dirty

Answer: (C)

In a manhole, hazardous atmospheres can develop quickly, so any symptom tied to air quality should trigger an immediate response. If you start feeling sick to your stomach, that’s a clear sign your body is reacting to poor air quality—possible toxic gases or reduced oxygen. Exit right away to fresh air and don’t re-enter until the space has been properly tested and ventilated by qualified personnel. Thirst, sneezing, or feeling dirty aren’t reliable indicators of an unsafe atmosphere in this context, so they don’t require leaving the space in the same urgent way.