They said they could preserve your body in a machine for a 100 years, only maintainable by the staff, but what happens if their are no staff. Miles under the earth you are kept, safe and hidden from the world above, but with a virus spreading round the earth, millions are dying. This leads to the collapse of a world and everything goes crazy. But it is to late, as you are already in your hundred years like comma, but then major earthquakes damage the system that controls the wake up time. This is damaged and it is set to a MILLION years. Time to wake up!