I'm so sorry, man. This is my worst fear with a large collection of snakes, the worst thing that could happen. I can somewhat relate, a similar sort of thing happened to us with our rat shed last summer, the surge malfunctioned and the AC shut off. We lost all of our rats, some we considered pets and were very attached to.
Don't blame yourself at all, there's no way you could have foreseen it and you would have prevented it if you had.
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