There are approximately 1,300 hyperbaric treatment facilities (each of which has one or more hyperbaric chambers) that currently provide HBO2 therapy in the United States. As recently as two decades ago, the large majority of hyperbaric treatment facilities were available to provide emergent HBO2 treatments on a 24/7 basis, but today, fewer than 10% of these facilities offer emergency HBO2 treatment, and some of those facilities do so only intermittently. Electively scheduled patients being treated for wound healing deficiencies dominate the remainder of chamber usage, with some additional chambers used in support of civilian and military diving operations.