A PRESCHOOLER burned to death in front of his mom during ADHD treatment while trapped inside a pressurized oxygen chamber that “became a human incinerator." What is hyperbaric oxygen therapy? Hyperbaric oxygen therapy is usually delivered in a one-person hyperbaric chamber, according to Harvard University. The lawsuit alleged the center "advertised and sold treatment plans for hyperbaric treatment for over 100 conditions according to their website." In August the FDA said it was "aware of reports of serious injuries and deaths with use of hyperbaric oxygen therapy (HBOT) devices.