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An atmosphere is a measure of pressure. On the surface the weight of the miles of gases in the air over our heads exert 1 ATA (atmosphere absolute) on us. Since water is much denser and heavier, it takes only about 33 feet of seawater to produce the equivalent pressure of the atmosphere.

So on the surface we're under 1 ATA. At 33 feet seawater we have the original 1 from the atmosphere plus 1 from the seawater, exerting 2 ATA on our bodies. At 66 feet we're at 3 ATA, 99 at 4 ATA, and 132 at 5 ATA. Since freshwater is slightly less dense than seawater, the depths are slightly less.

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