OK. I don't think fluids compress much but let's say the water in this pool does and let's assume there is a seal that allows me to push my way in without allowing any water to escape. As I try to force my way into the pool, it's going to try to repel me. This will happen no matter which direction I try to enter from but let's say I am trying to enter from the bottom/ground. Once I have fought my way in to the center of the pool and there is water all around me which direction is the pressure going to push me?
As you say, water hardly compresses, especially against you, in terms of you being able to compress the molecular make up of it any further with your energy.
This being said, it also means that you could not get into the tank if it is solid because you cannot compress the water and you cannot displace it.
It means you need something to give.
You get that in atmosphere in terms of, you can compress it, right?
The other way I was looking at it was if their was a membrane surrounding the pool that stretched to allow me to enter. No matter how far I push into the pool this membrane will always be trying to pull me back. Is denpressure kind of like that?
Bingo. This should be a point for you to keep and you should never discard this point because this will ultimately help you with denpressure.
Having said that, do not think of the membrane as PULLING you back because nothing in life pulls. It appears to pull but the truth is it's all push and to understand it you have to see it from that point of view.
If you're serious and keep your mind ticking then I'll keep explaining. If you revert back to square one then it's just another waste of my energy in typing.
Let's see where you're at.