# What is the atmospheric pressure inside a submarine?

## What is the atmospheric pressure inside a submarine?

1 atmosphere
Even if the submarine dives to 300 meters (I’m picking something at random), you’ll feel mostly the same. It will be just like enjoying a cup of tea in a windowless room at sea level. This is because the interior of the vessel is kept at an approximate pressure of 1 atmosphere, which is what you feel at the surface.

## Do submarines need atmospheric pressure?

A sub always has a pressure inside that is about equal to the air pressure at sea level (let’s call it “1 atmosphere”). If the outside is also equal to 1 atmosphere there’s no pressure difference and no strain on the shell (hull) of the sub. At 10 meters below the surface, the pressure is 2 atmospheres.

How deep underwater is 2 atm?

33 feet
This means that at a depth of 33 feet deep in the ocean, there is a total pressure of 29.4 pounds per square inch (psi). This would be 2 ATMs of pressure.

### How do submarines survive water pressure?

Most submarines have two hulls, one inside the other, to help them survive. The outer hull is waterproof, while the inner one (called the pressure hull) is much stronger and resistant to immense water pressure. The strongest submarines have hulls made from tough steel or titanium.

### What is the crush depth of a submarine?

What is crush depth? The name is foreboding and fairly self-explanatory; it’s when the submarine goes so deep the water pressure crushes it, causing an implosion. The crush depth of most submarines is classified, but it’s likely to be more than 400 metres.

What happens to air in a sunken submarine?

is sunk, water as it enters will compress the air in the submarine until the air pressure equals that of the depth of water. At 33 ft., which is + I atmosphere, the air inside will be compressed to half its original volume ; and at + 2, 3, or 4 atmospheres or 66, 99, or 132 ft.

#### How deep can a human dive without a pressure suit?

That means that most people can dive up to a maximum of 60 feet safely. For most swimmers, a depth of 20 feet (6.09 metres) is the most they will free dive. Experienced divers can safely dive to a depth of 40 feet (12.19 metres) when exploring underwater reefs.

#### Why are fish not crushed by pressure?

Under pressure Fish living closer to the surface of the ocean may have a swim bladder – that’s a large organ with air in it, which helps them float up or sink down in the water. Deep sea fish don’t have these air sacs in their bodies, which means they don’t get crushed.