1. They don’t recognize a confined space
A confined space has few ways in or out and they may be difficult to get into or out of. They are not intended to be occupied by human beings on a regular basis and they may contain a hazardous atmosphere or other recognized safety and health hazard.

2. They trust their senses
We think that if a space looks safe, it is safe. But most hazardous atmospheres are invisible. You cannot see, taste or smell most toxic and deadly atmospheres.

3. They underestimate the danger
Before you finish reading a simple eighteen word sentences like this one, methane gas can knock you out. Exposure to some organic vapors may not kill you until the next day. Before entering a confined space, the person supervising the crew going in should make sure of the following: the personnel entering the space is knowledgeable of the hazards and have proper safety equipment; the volume is isolated, at atmospheric pressure and tagged; the monitoring requirements have been established and the area is properly posted.

4. They do not stay on guard Often, a person will forget that a hazard may develop after they have entered a space. Sometimes, the work you are doing inside the confined space causes the atmosphere to become deadly. If this is a possibility, testing for the space must be an ongoing process, not just something you do before someone enters.

5. They try to rescue other people
It is human nature to help a person in trouble. But the sad fact is that untrained rescuers usually die along with the victim they are trying to save. Holding your breath is not enough protection in a confined space that is filled with a hazardous vapor, is oxygen deficient, or is blanketed with smoke.

Calling for help is the most important thing you can do to save the life of a person who is unconscious in a confined space. Only if you have appropriate rescue equipment and personnel available should a rescue attempt be made.

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