The pressure on a submarine increases the deeper you get (about 1 bar for every 10 meters), so the answer to your question is, "It depends how deep you want to go." Sadly, most of these figures on thicknesses are classified, so you'll have to calculate that yourself.
Submarine hulls are subject to sea pressure, and that pressure increases the deeper the submarine goes. There are design limits to the amount of pressure that a hull can take, and if that pressure is exceeded by diving too deep, the hull will fail and will be crushed.
Just like gases, water exerts pressure due to its weight, and this pressure increases with depth. As a submarine descends, the water pressure surrounding it intensifies, which can be fatal if there are structural weaknesses in the hull. If these weaknesses are not addressed, the immense pressure can cause the submarine to be crushed, compromising its integrity and safety. This is why submarines are designed to withstand significant underwater pressure.
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A structural problem on a submarine may make it possible for that vessel to be crushed as it descends. It may or may not be likely to be crushed, and that would depend on the nature of the problem and how deep the submarine descended.
The pressure exerted on the hull of the sub will get too great and crush it.
there is too much water pressure so it will be crushed under all the weight.
They are crushed
The weight of one square yard of crushed seashells will depend on the thickness and density of the crushed shells. On average, crushed seashells weigh around 1,500 to 2,000 pounds per cubic yard, so you can use this range to estimate the weight of one square yard based on the thickness of the layer.
When water is taken into the tanks of a submerged submarine, its total volume increases, displacing more water and increasing its buoyant force. This increases the upward force acting on the submarine, causing it to rise in the water or maintain a shallower depth.
Pressure on the inside is the same as the pressure on the outside. No different from why doesn't the air pressure of 15 psi not squeeze us flat.
The fluids in your body also exert pressure.