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Roko comments on A proposal for a cryogenic grave for cryonics - Less Wrong
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[grin] I wasn't sure if those were sci-fi or not.
Sure, for starters, but it's hard to say what will and won't be permafrost in 100 years, what with the non-trivial risk of catastrophic climate change and all. If the tank is built right, I think rolling, although unlikely, would still be one of the top 5 most likely failure modes; it is an easy enough flaw to fix.
Even municipal water towers, e.g., aren't perfect spheres, and nobody expects those to fall off their columns and plow through downtown Suburb Beach.
I can verify that these places are accessible, and that the permafrost extends quite a bit farther south than one might expect. I used to live just south of the Yukon territory.
There are regular long-haul trucks that go up there all year round; if you go in winter, you can use an ice road to get to the very cold and remote places. Given the regular volume of traffic, I'd say the cost is not prohibitive. I can get precise figures if you'd like.
Hits on google for "coldest place on earth" seem unanimous that it's somewhere in Antarctica. Here's an interesting newspaper article:
http://www.telegraph.co.uk/news/worldnews/antarctica/6121866/Scientists-identify-coldest-place-on-earth.html
This sounds like it could be a lot of fun.
This place is much colder...
http://gcaptain.com/maritime/blog/wp-content/uploads/2007/07/inside-lng-tank.jpg
If you could only get permission to use it...