The assumptions of a 230 mph wind speed and a 1.2 psi rapid pressuredecrease in about 1 second along with large and fast missiles is quite a force to design against.
The effects of depressurization on internal structures is not intuitively obvious to non-engineers, but a 20 foot wide by 20 foot high wall that sees a 1.2 psi rapid pressuredecrease feels a load of about 70, 000 lbs of horizontal force.
Although jets are pressurized so that the cabin environment resembles an altitude of around 8, 000 feet, some people report that flying (possibly from the changes in pressure and resulting decrease in oxygen concentration) causes symptoms such as headache, fatigue and nausea.
For this quarter, the firm expects profit margins from the region to be between 8.5% and 9.5%, down from around 11.7% in Q3 due to its heavy exposure to the oversupplied pressure pumping market and a decrease in land based drilling demand.