This video from WorkSafeBC is designed for municipal workers and illustrates the basic rules for working in confined spaces. Oxygen deficiency and other potential dangers are covered. In addition, the health effects and physical characteristics of toxic gases including carbon monoxide, hydrogen sulphide, and methane are examined.

WorkSafeBC is a Canadian agency that regulates industrial worker health and safety. Basically, the Canadian version of America's OSHA.

This video covers a timely subject for many Hazardous Materials Response Teams as many such teams are expected to work in confined (also refered to as enclosed) spaces and perform rescues in such locations.