One of the most popular tanks for American divers, cylinders for the rest of the world, was the Steel 72. Really, it was 71.2 cubic feet. Actually, it was only 64.63 cubic feet if it wasn’t overfilled 10%. For years it was regarded as the perfect size, and there was a belief that you couldn’t get into decompression with it. This week the boys dive into a piece by USAF Capt Robert D. Smith and get intimate with gas planning.

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