Why do some sunken ships have air pockets even when on the ocean floor?
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Generally air pockets form where the air cannot escape.
If under tons of pressure, the air pocket gets smaller as the air is compressed, but if it cannot escape it cannot escape.
If the air got trapped there when ship was sinking, then it just stays there, as there’s nowhere to escape. Air can only escape upward, so if ship sinks, in some areas air just never gets a chance to escape
Because the air gets trapped inside when the ship first sinks and has no where to go.
That air pocket can’t just absorb through the metals walls out of the ship, and it can’t go down into the water then back up and out, gravity won’t let that happen.
So, it just stays trapped there unless there’s a hole or crack or soemthing to get through.
Take a glass, turn it upside down, and put it in water. Press it down until it is underwater. There is no place for the air to get out, so it stays. It will slowly mix with the water and get out that way, but that can take months.
There’s air in the ship when it start sinking. As water levels rise, air gets pushed upwards. Some places on the ship, the air cannot escape the ship by going upwards. Unable to go upwards (there’s ship), and unable to go downwards (there’s water), the air stays trapped in the ship, even at the bottom of ocean. That’s the air pocket.
You get air pockets in cave system in a very similar way – water levels rise, air gets stuck.
Imagine taking a bucket, flipping it upside down and forcing it underwater. The water won’t fill it up because there’s still air trapped inside, and it has nowhere to go. This is the same that happens on sunken ships, just on a larger scale
Airtight door to room, no water gets in, go in without water entering somehow. Boom u can probably breath
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