There is one place where hyperbaric oxygen treatment works well. As scuba divers know (or watchers of old Sea Hunt episodes might recall), divers who surface too quickly from deep in the ocean can develop a condition called the bends. The bends is a great and painful example of the ideal gas law in action. Down at the ocean's bottom, pressure is extremely high; as a result, various gasses dissolve at greater concentrations than at the surface. When a person ascends too quickly from high to lower pressure, the dissolved gas un-dissolves and turns into bubbles; the bubbles can lodge in arteries and block blood flow, causing injury and pain to any tissue in the body. The antidote is some time in a hyperbaric chamber, where once again the bubbles dissolve, arteries are cleared, and pain disappears.