The maximum depth $d_{\text{m}\text{a}\text{x}}$ that a diver can snorkel is set by the density of the water and the fact that human lungs can function against a maximum pressure difference $($between inside and outside the chest cavity$)$ of $0\mathrm{.}049$ atm. What is the difference in $d_{\text{m}\text{a}\text{x}}$ for fresh water and the water of the DeadSea $($the saltiest natural water in the world, with a density of $1\mathrm{.}39{10}^{3}k\frac{g}{m^3})?$

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