system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do scientists cryogenically freeze people without knowing the process of unfreezing them? How can they say that revival is possible if they haven’t been able to do it?
gpt
The idea is that the revival technology will be developed in the future.

People who have done this left instructions to be frozen immediately after their death from terminal illness, on the offhand chance that a way to revive and cure them is eventually discovered.

The companies that handle this process make no guarantees that you’ll ever actually come back, only that they’ll do their best to maintain your mummy for as long as the trust funds last.