hi
my boyfriend has just hibernated his two tortoises for the first time and he is very worried about them. I understand that putting your pets in the fridge for months on end must be really terrifying, but is there anything that I can tell him to reassure him? How risky is the process really? Does anyone know any stats about how many pet tortoises don't make it through hibernation or anything like that? I would love some help if anyone can offer some, I really want to make him feel happier about this. He didn't hibernate them last year, so he's very worried about this.
Thank you

p.s they are horsefield tortoises, incase that helps anyone.