Hydrostatic Pressure: Submarine Crew Escape Force Needed

[Bassalisk]

Homework Statement

In a submarine, at a specific time, her bottom part is at 30m below surface. Submarine gets a part fail. If the crew would like to get out, they would have to push the door of area 0,75 m^2. Door is at the bottom of the submarine and has weight of 300 N.
If you have a normal atmospheric pressure inside the submarine, what force would crew have to exert on the door to get out. Density of the water is 1,03 * 10^3 kg/m^3

Homework Equations

p=rho*g*h;
p=F/s;

The Attempt at a Solution

I know how to work on the problem, and i get an result. But my question here is do atmospheric pressures cancel each other out? Because u have pressure at surface pushing, and pressure in submarine pushing.

Thanks

 

[Doc Al]

But my question here is do atmospheric pressures cancel each other out? Because u have pressure at surface pushing, and pressure in submarine pushing.

Yes. Since you have atmospheric pressure on both sides, they cancel.

 

[Bassalisk]

Yes. Since you have atmospheric pressure on both sides, they cancel.

Thank you