Teams carrying out work in a hyperbaric environment, as referred to in 2° of Article R. 4461-1, are made up of at least two people:
1° An operator working in a hyperbaric environment who holds a hyperbaric fitness certificate;
2° A supervisor, trained to provide first aid in the event of an emergency, who ensures the safety of workers working in a hyperbaric environment from a suitable location subject to local atmospheric pressure and containing means of communication, warning and rescue.