09:02, 6/24. As suddenly as the others, a large meteorite collides with Icelus Station. The initial point of impact is over rooms 5 and 6, creating a hole roughly the same size as one of the shower rooms. It continues onward, ripping through the dining room and processing room just below, as well as the livestock pens, and on through the set of aeroponic and hydroponic chambers before finally lodging itself well inside the ice beneath the station, causing massive amounts of structural damage as the ice and rock shifts.
It takes no more than thirty seconds for the entire station to lose its heat and internal atmosphere - just enough time for you to realize the horror of what has happened, but not enough time for you to do anything about it. For those who are human or otherwise mortal, Time Lords included, death is inevitable. For those who are immortal, undead, or otherwise not alive in a biologically meaningful sense, congratulations, you are still immortal, undead, or otherwise not alive.
And then something strange happens. Those who died remember their deaths, and yet they are alive again, still standing just where they were before the collision. Everything is undamaged, and no sign of any asteroid impact on the colony - not even the previous minor strikes - can be found. If it wasn't for the clocks on the station, which now read 09:03, 6/24, it would seem that none of the past few days had ever happened.
Oh, right, and the immortals. They aren't there. No, they appear five hours later, although they, too, reappear in exactly the places they were when the meteorite struck, and they are not aware of the time having passed. From their perspectives, everyone was killed in a horrible accident, and then everything was fine again suddenly, only the clocks seem five hours too late in the day. Strange, indeed.