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Maximum Operating Depth (MOD)The MOD is the maximum depth to dive with a gas mixture containing a specific oxygen content. The MOD is a function of oxygen exposure, the breathing of a specific partial pressure of oxygen (PO2) for a specific amount of time. |
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| The maximum PO2 for sport diving is widely considered to be 1.6 ATA, limiting dives to 45 minutes. Higher than 1.6 ATA, the risk of central nervous system oxygen toxicity increases dramatically. A lower PO2 allows a longer dive with a lower oxygen exposure. Technical divers and sport divers with longer bottom times usually limit their PO2 to 1.3 or 1.4 ATA. |
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To download the preceding table as a 22Kb Excel spreadsheet with embedded formulas:
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