Question 838763
p(d) = 1 + d/33
d is the depth in feet.
p is the pressure in atmospheric units of measure.


1 atm is defined as the pressure of the air at ground level.


per the formula, the deeper you go, the greater the pressure.
when d = 100, the equation becomes:
p(100) = 1 + 100/33
simplify this to get:
p(100) = 4.03030303 atmospheres or atmospheric units.


p(0) = 1 atm which means 1 unit of atmospheric pressure.
at 100 feet depth, the pressure is 4 times as much.


1 atm is roughly equivalent to 14.7 psi (pounds per square inch of force)
at a depth of 100 feet, 4.03 atm is roughly equivalent to 58.8 pounds per square inch 


the deeper you go, the greater the pressure.
underwater vessels (like submarines) have a limit to the amount of pressure their hulls can stand before they start buckling.
if the underwater vessel goes too deep, it could it's tolerance for withstanding the pressure and suffer a catastrophic failure. 


if you're interested, you can probably do some google searches on the internet involving what happens to submarines when they exceed their capacity to withstand the pressure at great depths.