College Physics (4th Edition)

We can find the depth $h$ under the ocean surface where the absolute pressure is 1000 atm: $P_{abs} = P_{atm}+P_g$ $P_g = P_{abs} - P_{atm}$ $P_g = 1000~atm -1~atm$ $P_g = 999~atm$ $P_g = (999~atm)(\frac{1.01\times 10^5~N/m^2}{1~atm})$ $\rho~gh = 1.009\times 10^8~N/m^2$ $h = \frac{1.009\times 10^8~N/m^2}{\rho~g}$ $h = \frac{1.009\times 10^8~N/m^2}{(1025~kg/m^3)(9.80~m/s^2)}$ $h = 1.00\times 10^4~m$ $h = 10.0~km$ These organisms can live at a maximum depth of 10.0 km under the sea.