Best's lung problems were caused by an element of his rebreather overheating, which created caustic soda to be generated. The rebreather contains a filter that removes carbon dioxide from expelled breath, making it possible to "re-breathe" expelled oxygen. This is supplemented by another tank containing oxygen to make up the difference. Best had contracted tuberculosis in his youth but it had remained dormant, contained in nodules that were sealed over in response to the initial infection. The caustic fumes penetrated these nodules, releasing the tuberculosis. He was later treated for it and cured. While his lungs had sustained some permanent damage, he was eventually returned to good health.

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