1021H Confined Space Entry: The Silent Killers This training program provides an overview of the general types of hazards associated with confined spaces, basic atmospheric testing requirements, and more. The major emphasis for this program is the Attendant. Generally, this person is the least trained, yet has the life and death responsibility for those entering the confined space. This program helps the attendant understand his/her responsibilities. Attendant training is one of the most important confined space training programs you can use. (18 min.)