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Answer for the clue "Hibernation at ultra-low temperatures, in sci-fi ", 9 letters:
cryosleep

Word definitions for cryosleep in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context science fiction English) A deep sleep during which the body is stored at very cold temperature, to preserve it; cryogenic sleep.

Usage examples of cryosleep.

Solace, and, as per usual procedure with passengers, he had gone into cryosleep before any of the crew.

A person who traveled, over the course of several trips, for five centuries in cryosleep, but traveled down five one-century wormholes, would have gone through five centuries of self-chron time, but experienced virtually no subjective time, and might well end up in the same objective year from which he or she started.