I'm looking for more details on how currents work and why you think they can't make it back to land.

I'm really not sure about whether it can crack from inflow and outflow. Sometimes people make mistakes with original research and false rumours spread. Although you didn't link it, I can verify the other information that it it's a very likely theory that it can crack due to thermal stresses at cbc.ca/news/canada/saskatchewan/… which somebody else linked, which is the information I was looking for. That's the reason I put a check mark beside this answer.

research on a specific thing.

I just fixed up my question. I didn't think carefully. I thought it wouldn't invalidate your answer and now I see that it does. What should I do? I didn't know at the time I asked it that other people weren't going to willingly and happily devote a lot of time to the long project of gathering information that I described in the details. There probably are some people who would. They're just nearly impossible to fine. Maybe if the world finds the right complex research technique, there will be a nice easy method of locating through complex interaction, people who have a demand to participate in

Although I won't do it right now, I might later review this answer more slowly and carefully to see if I can figure out the details of the situation that I was looking for by reading this answer or whether it was too unclear for me to be able to. After I'm not able to, I might tell you what I'm still missing but I can't guarentee that I will.

is probably flowing away from the centre far enough below the surface because it's flowing towards the centre on the surface and more water can't just keep building up there. I supposed if there were lots of people and one of them had an inflatable ring, they could ask them to pass on the message like broken telephone to throw them the ring so that they could sit or lie on it and greatly extend the amount of time they can last there waiting to be rescued.

swimming pool, I discovered a way to stay still and keep breathing on the surface while expending very little energy. It was to temporarily hold my breath while lying on my back to make my lungs fuller and make me more buoyant then after a few seconds breathe out and then take another breath. Since that plan hasn't been organized yet, some people would probably do a really good job of thinking for themselves and not listen to your advice not to swim underwater and would decide that's they're only hope because the water is probably flowing towards the centre of the circle on the surface and

unnoticed. If you do answer my question by stating that sometimes you cannot escape a circle of water without swimming underwater, you could make it neutral and the fact that you can't escape without swimming underwater is not saying you should swim underwater. However, maybe the world could organize a new global plan where if somebody normally has the ability to swim 5 km on the surface and they get trapped in a circle of water, they will yell for help and then somebody with good hearing will call 911 and get a police boat to rescue them. Once when I was swimming in the deep end of a

If it's still not clear to most readers, I don't know what I can do to fix up my question although I'd probably have to ask a new one because the edit might invalidate your answer. If you don't know the answer to my actual question, then you don't need to write an answer. If you write an answer, I cannot check the accuracy of the answer because I don't know enough and don't want to invest a huge amount of time into researching rip currents and am trusting you did your own work to see that it's an accurate answer and if you take for granted that I'll catch a problem, the problem will sit there

I guess you meant people can sometimes get stuck because they don't know what to do. That's not actually what my question was. My question was whether it was possible that somebody who can keep swimming a really long time but cannot swim very fast in any type of rip current could put themself into a spinning circle of water and then literally be unable to escape without swimming underwater because the water on the surface is flowing towards the centre. I thought I made it clear what my question was by putting it in a question box. I'm not trying to criticize you. I'm trying to justify myself.