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this post was submitted on 08 May 2024
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Here's a link to the article in the screenshot, in case anyone else was interested in reading it like I was: https://www.freethink.com/futurology/cryogenically-frozen-humans
Thanks for this. Quite gruesome, but not at all unexpected. I remember having a conversation with a friend of mine a while back, where I made the argument that water expands when frozen and, since humans are mostly water, freezing a human would crack every vital organ. I'm actually upset to discover I was right.
there could be a way maybe, by freezing water while keeping it extremely pressurized (extremely), you can make "efficient ice" that occupies less space, called ice VII, I'm not kidding. It would cost literally billions of dollars so not yet feasible, but it keeps my sci-fi loving mind at ease.
Flash freezing can work, but it's almost impossible for something as large as a human body.
Cryoprotectants also do this pretty efficiently -- they prevent crystallization, which leads to "vitreous" ice, which has more or less the same structure as liquid water and so doesn't expand much. I think they do use that when freezing people, but the problem is that even if you fill the blood vessels with pure ethylene glycol, it diffuses very slowly, and it takes hours to get into cells which are far from large blood vessels. They dont diffuse the cryoprotectant in that thoroughly, though, because that'd take so long the body would have started to decay too much.
Edit: oops, the article talks about vitrifying agents. They make it sound like they're not effective, but as I said above, they're very effective if you can get them in every nook and cranny of every cell, which is a losing battle.