An industrial air cleaning company operating offshore is often involved in the cleaning of confined spaces within tanks and vessels. The method that is preferred by all concerned is for a no man-entry situation where the cleaning is performed by remote control, but this is not always possible. When it becomes necessary for workers to enter confined spaces to perform industrial cleaning operations, the first thing of importance to consider is the safety of all those who are involved in the operation. Proven safe and efficient procedures must be followed by all those who enter confined spaces for the purposes of cleaning. The workers need to be trained professionals who fully understand the need for safety rules and vigilance.