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To the Editor.—
In the July 10th issue of The Journal, the reader from Michigan stated his 42-year-old patient with an old mitral insufficiency dives with a single scuba tank, "which enables him to stay at a depth of 90 feet for two minutes." In order to clarify this for the readers, and correct the record, it should be noted that a single tank contains 70 cu ft of air, which normally lasts 70 minutes at sea level, 33 minutes at 33 feet, 16 1/2 minutes at 66 feet, and 8 1/4 minutes at 99 feet.
Sommer RM. Capacity of Diving Tank. JAMA. 1972;222(6):705. doi:10.1001/jama.1972.03210060055024