As such, they should always be tested for the presence of such atmospheric hazards prior to workers entering them. Once employees have entered a confined space, the space’s atmosphere should be continuously monitored to ensure that it remains safe. It is important that confined spaces be as well ventilated as possible in order to provide sufficient oxygen and discourage the accumulation of toxic gases. Employers should be mindful of coexisting hazards such as electrical energy, and should ensure that all equipment within the area is properly de-energized.