"Though unlikely, it is entirely possible that the universe has already collapsed and the end of reality as we know it is propagating towards us at the speed of light. We’ll never get any warning that it’s coming and it could hit us at any time, annihilating the entire planet in less than a tenth of a second."
That 100% death rate is not true actually.
At least one person survived.
Search for "Jeanna Giese" for more info.