Pressure at depth 'h' is given by:
P = Patm + rho*g*h
Patm = atmospheric pressure = 1 atm = 1.01325*10^5 Pa
rho = density of sea water = 1030 kg/m^3
g = 9.81 m/sec^2
h = depth = 4267 m
So,
P = 1.01325*10^5 + 1030*9.81*4267
P = 4.32*10^7 Pa = (4.32*10^7 Pa)/(1 atm/1.01325*10^5 Pa)
P = 426.35 atm
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