Day 2,455

From a distance they looked like divers only they seemed to float through the fog rather than swim through it. We thought they were kites at first, eerie and strangely realistic ones and far too early in the year for Halloween but we didn't for a moment think they might actually be living beings.

They definitely weren't human, that much we know. For starters their eyes are far too bulbous and pressed tightly against the goggles that seem to meld into their skin. Even the re-breathers they 'wear' look organic and gently twitch in time to the heartbeat that echoes all around them.

Did I mention they were about twelve feet tall including the flippers that definitely had veins running through them? They were as human as a shadow and we thought they were just as harmless until their heads lolled to one side, revealing surprisingly large and well camouflaged jaws with enough teeth to make a shark blush.

One-by-one they dropped over the closest human to them and snapped shut, severing the meat and letting their lower half fall to the ground with a muffled thud. That alone was enough to send almost everyone into a panic and make us all head for the closest open door, not realising they were penning themselves in.

Me and a few others hid under bushes, parked cars and even the fresh remains of their initial victims. As the screaming rose and rose and rose up all around us we made silent eye contact and hoped we'd all be able to escape once the feeding frenzy was done.

But when the screaming stopped, the divers just drifted back up and began to patrol instead. It was like they could sense us within the fog but couldn't quite pin us down. I dread to think how long we waited in our hiding places, desperately trying to become as silent as the divers above, painfully aware of how loud our breathing was.

I don't know what drew them away or even which direction they took.

I don't know if it was something worse than them or the lure of fresh prey.

All I know is that we lived and there hasn't been a day of fog since.