deep freeze

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Some scientists have suggested that Toba caused the deep freeze and that perhaps such an event happening today could bring on a new ice age.
一些科学家们提出：是多巴火山引起了地球的深层冻结，如果当今有这样的火山爆发，或许会引起一个新的冰河时代。
huzhangao.blog.163.com
The continents may have been in a total deep freeze, or the planet may have simply been subjected to a patchwork of constantly moving glaciers or icebergs—or something in between.
所有大陆可能曾处于完全深层次的结冰状态或者说整个星球可能是被移动中的冰川或者冰山控制--或者说是介于两者之间的某种物质。
It's true that severe cold can throw plans and schedules into disarray, but around the world we've figured out various winter delights that make a deep freeze seem–well, almost welcome.
尽管严寒可能打乱了许多计划以及日程安排，但在世界范围内，我们已经看到各式各样冬季带来的欢乐，这也使得人们似乎不再那么抗拒严寒。

Yet it is too soon to conclude that Franco-German relations have gone into the deep freeze.
ECONOMIST: Charlemagne
Chinese and Japanese diplomats are searching for a way to bring their countries relationship out of a deep freeze.
NPR: Chinese-Japanese Tensions Test U.S. Strategy
Fourth, Fukushima has put the nuclear industry for now in the deep freeze.
FORBES: Mini-Nukes Back From Grave As Fluor Invests In NuScale Power