You can protect yourself. Learn their hidden hazards and use safe practices. It's the smart way to stay safe. Few Openings Confined spaces have few or very small openings. They're not meant for workers to stay in.
Ventilation is usually poor.
Four Dangers There are four main dangers in confined spaces. First, there may not be enough oxygen to breathe. Rust, sewage, or chemicals can use it up. Even if there's enough oxygen when you enter, it can be used up by your presence and your work more quickly than you might think. Second, fire and explosions can both use up oxygen quickly enough to prevent escape and cause death within minutes.