 In this study, in addition to standard radiation and chemotherapy described above, the patient will also receive the experimental hyperbaric treatment prior to each radiation treatment Monday-Friday during the initial six weeks of treatment. Prior to the first hyperbaric treatment, the patient will need to have a chest x-ray performed to make certain that you do not have any preexisting abnormal air spaces in the chest or lungs that could be worsened by hyperbaric treatment. The hyperbaric treatment lasts approximately thirty minutes. During the hyperbaric treatment, the patient will lie on a stretcher in the hyperbaric chamber and breathe oxygen at greater than normal atmospheric pressure. The investigators will monitor the increased oxygen levels in the tissue by placing a noninvasive electrode on your skin. After each hyperbaric treatment, the investigators will measure the participants blood sugar by finger-stick to check for hypoglycemia low blood sugar. If detected, hypoglycemia will be treated by standard medical measures. 