A hyperbaric chamber caught fire in Arizona, leading to the gruesome death of a 43-year-old man inside the highly pressurized, oxygen-filled compartment, authorities said Thursday.

A late-night session in a hyperbaric oxygen chamber turned fatal for an Arizona man on Wednesday. At around 10:50 p.m., the Lake Havasu City Fire Department responded to a distress call after a 911 caller reported a burn patient needing emergency medical assistance at Havasu Health

One man is dead after fire inside a hyperbaric chamber in Lake Havasu City, Ariz., the second such fatality in the United States this year.