The parents of a 5-year-old boy killed in a hyperbaric chamber explosion earlier this year have filed a $100 million lawsuit, claiming the tragedy was the result of gross negligence. What Happened at The Oxford CenterThomas Cooper died on January 31 when the chamber at The Oxford Center in Troy exploded. The suit also claims the chamber was operated without proper licensing, inspections, or trained medical supervision. Gallery Credit: Stacker50 Most Popular Chain Restaurants in America YouGov investigated the most popular dining brands in the country, and Stacker compiled the list to give readers context on the findings. Gallery Credit: Paul Feinstein