Hyperbaric oxygen therapy patients who are comatose, irritable, unable to care for themselves, have communication problems or are infants and young children need to be accompanied by a family member into the chamber. The medical staff will provide professional accompaniment during hyperbaric oxygen therapy for critically ill patients. The requirements for the companion during hyperbaric oxygen therapy are that if there is a recent history of serious upper respiratory tract infection, severe hypertension, coronary artery disease, emphysema, pulmonary herpes, tuberculosis cavity, etc., the companion is not recommended to enter the cabin. However, the specific ability to enter the cabin is subject to the judgment of a specialist in hyperbaric medicine. The chaperones who enter the chamber are mainly to complete the routine escort work in the chamber, assist the patient to wear the mask to complete effective treatment, and at the same time to communicate with the operators outside the chamber.